Switch Docker base image from Alpine to Debian slim - #4307
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Devcontainer tooling (git/gh/docker-outside-of-docker features, Playwright's OS dependency installer) expects an apt-based distro; Alpine's musl/apk environment isn't supported by most of it. Debian slim keeps a similar image size while being broadly compatible. Updates the production runner stage's user creation to Debian's groupadd/useradd (Alpine's addgroup/adduser aren't available), and drops the now-unnecessary libc6-compat package (Alpine-only, not needed on glibc-based Debian).
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Devcontainer tooling (git/gh/docker-outside-of-docker features, Playwright's
OS dependency installer) expects an apt-based distro; Alpine's musl/apk
environment isn't supported by most of it. Debian slim keeps a similar image
size while being broadly compatible.
Updates the production runner stage's user creation to Debian's
groupadd/useradd (Alpine's addgroup/adduser aren't available), and drops the
now-unnecessary libc6-compat package (Alpine-only, not needed on glibc-based
Debian).