diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index 2af46a9..5e06141 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -19,9 +19,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      # type=gha depends on act_runner's internal cache proxy, which is unreachable
-      # from job containers on this runner (dial tcp ... i/o timeout). Use the
-      # registry cache backend instead, same as docker-publish.yml.
       - name: Log in to Gitea registry
         uses: docker/login-action@v3
         with:
@@ -46,6 +43,7 @@ jobs:
           name: graph-dev-image
           path: /tmp/graph-dev.tar
           retention-days: 1
+
   build-prod:
     needs: build-dev
     runs-on: ubuntu-latest
@@ -77,11 +75,13 @@ jobs:
           name: graph-dev-image
           path: /tmp
 
-      - name: Load dev image
+  - name: Load dev image
         run: docker load --input /tmp/graph-dev.tar
 
-      - name: Run PHPUnit
-        run: docker run --rm -v "$(pwd)":/app -v /app/vendor graph-dev:ci vendor/bin/phpunit --testdox
-
-      - name: Run PHPStan
-        run: docker run --rm -v "$(pwd)":/app -v /app/vendor graph-dev:ci composer phpstan
+      - name: Run tests in dev image
+        run: |
+          docker run --rm -v "$(pwd)":/app -v /app/vendor graph-dev:ci sh -c "
+            composer install --no-interaction &&
+            vendor/bin/phpunit --testdox &&
+            composer phpstan
+          "