Split building the test image and running tests

This makes navigating the logs in the GitHub actions UI eaiser.

Author: britter

.github/workflows/integration-tests.yml

@@ -14,10 +14,15 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Run integration tests with docker compose
+      - name: Build test image
+        run: |
+          cd integration-tests
+          docker compose build
+
+      - name: Run integration tests
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           cd integration-tests
-          docker compose up --build --abort-on-container-exit
+          docker compose up --abort-on-container-exit