One image per PHP version, published to git.unsupervised.ca/unsupervised/ci-php:<php-version>, so PHP projects can run their jobs with `container:` instead of installing PHP per job. Built on php:<version>-cli-alpine with Composer 2, the intl and zip extensions, and the GNU CLI tools workflow scripts expect. bash and nodejs are present because act_runner runs JavaScript actions inside the job container; GNU tar because actions/cache shells out to `tar --posix -P`, which busybox rejects. Covers 8.1 through 8.5. Pushing needs the REGISTRY_TOKEN organisation secret — Gitea's Actions task token cannot write packages (go-gitea/gitea#23642). Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01D9acV1mHktGAb1uyvNmrR2