Add 'linux' as platform for labels

[lucasmrod]

Resolves #44088.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.

• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements), JS inline code is prevented especially for url redirects, and untrusted data interpolated into shell scripts/commands is validated against shell metacharacters.

Testing

• Added/updated automated tests
• QA'd all new/changed functionality manually.

[Copilot]

Warning

• Copilot's review of this pull request may be incomplete because some of the changed files are excluded by your Copilot content exclusion settings. See Excluding content from Copilot for details.

Pull request overview

Adds support for a generic linux platform option when creating/editing labels so label platform scoping can target all Linux distributions (not just Ubuntu/CentOS), spanning backend validation + host matching, UI selection/display, and GitOps generation tests.

Changes:

• Accept linux as a valid label platform and ensure Linux hosts match both their distro-specific platform and the generic linux platform.
• Update UI platform selector/display strings to include “Linux” and clarify Ubuntu/CentOS as “(Linux)”.
• Extend integration/unit/GitOps tests and fixtures to cover platform: linux and round-tripping through spec endpoints and generated YAML.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
server/fleet/labels.go	Adds linux to the allowed label platform variants.
server/datastore/mysql/labels.go	Updates label query selection to match Linux hosts against both specific distro + generic linux via sqlx.In.
server/datastore/mysql/labels_test.go	Adds datastore-level test coverage for generic linux platform labels across multiple Linux host platforms.
server/service/integration_core_test.go	Updates integration coverage for invalid platforms and adds create/spec round-trip coverage for platform: linux.
frontend/pages/labels/components/PlatformField/PlatformField.tsx	Adds “Linux” option and updates display strings for Ubuntu/CentOS.
frontend/pages/labels/components/PlatformField/PlatformField.tests.tsx	Adds component tests for the new Linux option and updated edit-mode display text.
cmd/fleetctl/integrationtest/gitops/gitops_enterprise_integration_test.go	Extends GitOps integration test fixture to include a label with platform: linux.
cmd/fleetctl/fleetctl/generate_gitops_test.go	Extends mock label specs so generated GitOps output includes a linux platform label.
cmd/fleetctl/fleetctl/testdata/generateGitops/test_dir_premium/default.yml	Updates expected generated GitOps YAML fixture to include a linux platform label.
cmd/fleetctl/fleetctl/testdata/generateGitops/test_dir_free/default.yml	Updates expected generated GitOps YAML fixture to include a linux platform label.
cmd/fleetctl/fleetctl/testdata/generateGitops/expectedLabels.yaml	Updates expected labels YAML output to include the linux platform label.
changes/44088-linux-label-platform	Changes entry (content excluded by policy).

Files excluded by content exclusion policy (1)

• changes/44088-linux-label-platform

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[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.17%. Comparing base (554c62e) to head (c95f99b).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
server/datastore/mysql/labels.go	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #50270      +/-   ##
==========================================
+ Coverage   68.15%   68.17%   +0.01%     
==========================================
  Files        3934     3935       +1     
  Lines      250923   250987      +64     
  Branches    13281    13285       +4     
==========================================
+ Hits       171012   171104      +92     
+ Misses      64581    64547      -34     
- Partials    15330    15336       +6     

Flag	Coverage Δ
backend	69.46% <84.61%> (+0.01%)	⬆️
frontend	61.30% <ø> (+0.05%)	⬆️

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[Copilot]

Warning

• Copilot's review of this pull request may be incomplete because some of the changed files are excluded by your Copilot content exclusion settings. See Excluding content from Copilot for details.

Pull request overview

Copilot reviewed 11 out of 12 changed files in this pull request and generated no new comments.

Files excluded by content exclusion policy (1)

• changes/44088-linux-label-platform

[Copilot]

Warning

• Copilot's review of this pull request may be incomplete because some of the changed files are excluded by your Copilot content exclusion settings. See Excluding content from Copilot for details.

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Files excluded by content exclusion policy (1)

• changes/44088-linux-label-platform

Comments suppressed due to low confidence (1)

cmd/fleetctl/fleetctl/gitops_test.go:389

• The YAML fixture label name still says "Test - Linux invalid platform", but this PR makes "linux" a valid label platform. Renaming this string will keep the test intent clear (it’s testing rejection of an invalid platform value like "bados").

  - name: Test - Linux invalid platform