ci(gitea): run CI in a prebuilt PHP image instead of setup-php bootstrap

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AqpXh3hQMMaC74pTjFq4it

.gitea/workflows/pipeline.yml

@@ -16,6 +16,7 @@ jobs:
   lint-php:
     name: PHP Lint (${{ matrix.php }})
     runs-on: ubuntu-latest
+    container: git.protopeer.com/peptide-repo/ci-php:2026-10
     strategy:
       fail-fast: false
       matrix:
@@ -29,6 +30,7 @@ jobs:
   phpcs:
     name: PHPCS (WordPress standards)
     runs-on: ubuntu-latest
+    container: git.protopeer.com/peptide-repo/ci-php:2026-10
     steps:
       - uses: actions/checkout@v4
         with: