fix(ci): correct container image expression

Replace setup-php action with pre-built container.
Eliminates ~50s setup overhead per matrix job.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.forgejo/workflows/ci.yml

@@ -0,0 +1,57 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    name: PHP ${{ matrix.php }}
+    runs-on: ubuntu-latest
+    container:
+      image: lthn/build:php-${{ matrix.php }}
+
+    strategy:
+      fail-fast: true
+      matrix:
+        php: ["8.3", "8.4"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Clone sister packages
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo "Cloning php-framework into ../php-framework"
+          git clone --depth 1 \
+            "https://x-access-token:${GITHUB_TOKEN}@forge.lthn.ai/core/php-framework.git" \
+            ../php-framework
+          ls -la ../php-framework/composer.json
+
+      - name: Configure path repositories
+        run: |
+          composer config repositories.core path ../php-framework --no-interaction
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-interaction --no-progress
+
+      - name: Run Pint
+        run: |
+          if [ -f vendor/bin/pint ]; then
+            vendor/bin/pint --test
+          else
+            echo "Pint not installed, skipping"
+          fi
+
+      - name: Run tests
+        run: |
+          if [ -f vendor/bin/pest ]; then
+            vendor/bin/pest --ci --coverage
+          elif [ -f vendor/bin/phpunit ]; then
+            vendor/bin/phpunit --coverage-text
+          else
+            echo "No test runner found, skipping"
+          fi