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feat: add centos to the OS matrix
Adds os/centos (CentOS Stream 9, quay.io/centos/centos:stream9), generated from a new _dev/_os/centos Copier source that mirrors rhel's, sharing the existing redhat Ansible family (same dnf package list works unmodified on both). Verified end-to-end locally: Ansible provisioning and the web-browserlibrary RF suite both pass headless in the container. The shared redhat.yml caveat comment was Rocky-Linux-10-specific and would have been misleading for centos: CentOS Stream 9's AppStream repo actually ships Xvfb and Google Noto Color Emoji (verified live), unlike Rocky 10. Reworded it to state what's true of each release instead of overclaiming. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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‎.github/workflows/run-suites.yml‎

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# ── Stage 3: os content type (provision + verify + report) ────────────────
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# Independent of the detect-changes/test pair above: exactly one job per OS
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# family, added deliberately one epic at a time (Story 1.5 adds debian;
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# Stories 2.2/3.2/4.2 each add one more matrix entry), never auto-detected
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# from a directory listing the way the examples/templates matrix is.
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# Stories 2.2/3.2/4.2 each add one more matrix entry; centos is a later
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# addition sharing the redhat family with rhel), never auto-detected from a
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# directory listing the way the examples/templates matrix is.
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os:
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runs-on: ubuntu-latest
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strategy:
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fail-fast: false
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matrix:
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slug: [debian, ubuntu, rhel, sles]
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slug: [debian, ubuntu, rhel, sles, centos]
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steps:
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- uses: actions/checkout@v4

‎README.md‎

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| OS | Base Image | Repository Link |
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|---|---|---|
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| [centos](os/centos) | `quay.io/centos/centos:stream9` | [try out](https://github.com/robotmk/os-centos) |
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| [debian](os/debian) | `debian:13` | [try out](https://github.com/robotmk/os-debian) |
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| [rhel](os/rhel) | `rockylinux/rockylinux:10` | [try out](https://github.com/robotmk/os-rhel) |
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| [sles](os/sles) | `registry.suse.com/suse/sle15:15.7` | [try out](https://github.com/robotmk/os-sles) |

‎_dev/_ansible/roles/browser-deps/tasks/redhat.yml‎

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---
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- name: Install Chromium/Playwright system dependencies (Rocky Linux 10 / EL10 package names)
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- name: Install Chromium/Playwright system dependencies (RHEL-family / EL9+EL10 package names)
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ansible.builtin.dnf:
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name:
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- alsa-lib
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state: present
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update_cache: true
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- name: Record Rocky's missing Xvfb/emoji/unifont packages as a caveat, not a silent gap
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- name: Record this family's missing Xvfb/emoji/unifont packages as a caveat, not a silent gap
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ansible.builtin.set_fact:
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install_report_caveats:
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browser-deps:
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- >-
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Rocky Linux 10's base+AppStream repos do not provide Xvfb, Google
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Noto Color Emoji, or GNU Unifont (Noto Color Emoji is available via
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EPEL, which this role deliberately does not enable, to stay close
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to a stock install). Headless Chromium does not require Xvfb to
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launch, so this does not block verification, but pages relying on
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color emoji or Unifont's broad Unicode coverage may render with
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fallback glyphs. Liberation fonts and scalable X fonts ARE
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available here, unlike SLES's free BCI image.
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GNU Unifont is not available in this family's base+AppStream repos
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without enabling EPEL, which this role deliberately does not, to
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stay close to a stock install (verified on both Rocky Linux 10 and
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CentOS Stream 9). Xvfb and Google Noto Color Emoji availability
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varies by release: absent from Rocky Linux 10's repos (also
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EPEL-gated there), but present in CentOS Stream 9's AppStream.
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Headless Chromium does not require Xvfb to launch, so none of this
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blocks verification, but pages relying on color emoji or Unifont's
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broad Unicode coverage may render with fallback glyphs on Rocky.
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Liberation fonts and scalable X fonts ARE available on both, unlike
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SLES's free BCI image.

‎_dev/_os/centos/copier.yml‎

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_subdirectory: template
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_answers_file: .copier-answers.yml

‎_dev/_os/centos/populate.yaml‎

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populate:
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- src: _dev/_ansible
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dst: .devcontainer/ansible
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exclude:
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- "*.pyc"
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- "__pycache__"
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- src: templates/web-browserlibrary
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dst: tests/web-browserlibrary
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exclude:
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- "*.pyc"
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- "__pycache__"
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- "output"
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- "log.html"
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- "report.html"
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- "output.xml"
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- "browser"
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- "playwright-log.txt"

‎_dev/_os/centos/template/.copier-answers.yml.jinja‎

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# This file is managed by Copier.
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# Do NOT edit manually. To regenerate: task generate
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_src_path: {{ _copier_conf.src_path }}
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_commit: {{ _copier_conf.commit or 'none' }}

‎_dev/_os/centos/template/.devcontainer/ansible.cfg‎

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[defaults]
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callbacks_enabled = install_report

‎_dev/_os/centos/template/.devcontainer/devcontainer.json.jinja‎

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{
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"name": "os-centos",
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"image": "{{ centos_image }}",
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"customizations": {
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"vscode": {
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"extensions": [
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"ms-python.python",
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"d-biehl.robotcode",
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"redhat.ansible"
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]
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}
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},
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"onCreateCommand": "bash .devcontainer/oncreate.sh",
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"postCreateCommand": "bash .devcontainer/postcreate.sh"
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}

‎_dev/_os/centos/template/.devcontainer/playbook.yml‎

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---
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- name: Provision OS environment
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hosts: localhost
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connection: local
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roles:
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- browser-deps

‎_dev/config/versions.env‎

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# rhel slug is a documented exception to the generic <SLUG-UPPER>_IMAGE
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# derivation: the key is RHEL_COMPAT_IMAGE, not RHEL_IMAGE, because the pinned
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# image is a RHEL-compatible substitute (Rocky Linux), not RHEL itself.
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RHEL_COMPAT_IMAGE=rockylinux/rockylinux:10
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RHEL_COMPAT_IMAGE=rockylinux/rockylinux:10
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CENTOS_IMAGE=quay.io/centos/centos:stream9

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