[CI] Use more docker-image caching during testing

.github/workflows/test.yaml

@@ -94,7 +94,9 @@ jobs:
 
   build_and_push_anon_sis_db:
     name: 'Build anon sis-db and push to toska hub if new migrations have been added'
-    needs: check_migration_files
+    needs:
+      - pull_docker_images
+      - check_migration_files
     runs-on: ubuntu-latest
     if: needs.check_migration_files.outputs.sis_db_migrations == 'true'
     steps:
@@ -105,6 +107,16 @@ jobs:
           registry: registry-toska.ext.ocp-prod-0.k8s.it.helsinki.fi
           username: ${{ secrets.username }}
           password: ${{ secrets.password }}
+
+      - name: 'Download Docker images'
+        uses: actions/download-artifact@v8
+        with:
+          name: docker-images
+          path: /tmp
+
+      - name: 'Load Docker images'
+        run: zstd -d /tmp/docker-images.tar.zst --stdout | docker load
+
       - name: 'Let sis-updater-worker run migrations, then push new version of image to toska hub'
         run: |
           docker compose --file docker-compose.ci.yml up --detach sis-updater-worker
@@ -114,6 +126,7 @@ jobs:
   build_and_push_anon_kone_db:
     name: 'Build anon kone-db and push to toska hub if new migrations have been added'
     needs:
+      - pull_docker_images
       - build_backend
       - build_frontend
       - check_migration_files
@@ -121,18 +134,29 @@ jobs:
     if: needs.check_migration_files.outputs.kone_db_migrations == 'true'
     steps:
       - uses: actions/checkout@v6
+
+      - name: 'Download Docker images'
+        uses: actions/download-artifact@v8
+        with:
+          name: docker-images
+          path: /tmp
       - name: 'Download backend image'
         uses: actions/download-artifact@v8
         with:
           name: backend-image
+
+      - name: 'Load Docker images'
+        run: zstd -d /tmp/docker-images.tar.zst --stdout | docker load
       - name: 'Load built backend image'
         run: docker load --input backend.tar
+
       - name: 'Login to toska docker registry'
         uses: docker/login-action@v4
         with:
           registry: registry-toska.ext.ocp-prod-0.k8s.it.helsinki.fi
           username: ${{ secrets.username }}
           password: ${{ secrets.password }}
+
       - name: 'Let backend run migrations, then push new version of image to toska hub'
         run: |
           docker compose --file docker-compose.ci.yml up --detach backend
@@ -142,6 +166,7 @@ jobs:
   build_and_push_anon_user_db:
     name: 'Build anon user-db and push to toska hub if new migrations have been added'
     needs:
+      - pull_docker_images
       - build_backend
       - build_frontend
       - check_migration_files
@@ -156,18 +181,29 @@ jobs:
             migrations:
               - 'services/backend/src/database/migrations_user/**'
               - '.github/workflows/test.yaml'
+
+      - name: 'Download Docker images'
+        uses: actions/download-artifact@v8
+        with:
+          name: docker-images
+          path: /tmp
       - name: 'Download backend image'
         uses: actions/download-artifact@v8
         with:
           name: backend-image
+
+      - name: 'Load Docker images'
+        run: zstd -d /tmp/docker-images.tar.zst --stdout | docker load
       - name: 'Load built backend image'
         run: docker load --input backend.tar
+
       - name: 'Login to toska docker registry'
         uses: docker/login-action@v4
         with:
           registry: registry-toska.ext.ocp-prod-0.k8s.it.helsinki.fi
           username: ${{ secrets.username }}
           password: ${{ secrets.password }}
+
       - name: 'Let backend run migrations, then push new version of image to toska hub'
         run: |
           docker compose --file docker-compose.ci.yml up --detach backend