Change workflow to use cache instead of docker pull.

Author: Potherca

.github/workflows/ci.yml

@@ -24,6 +24,12 @@ jobs:
   build-docker-nextcloud:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/cache@v3
+        id: cache-solid-nextcloud-docker
+        with:
+          path: cache/solid-nextcloud
+          key: solid-nextcloud-docker-${{ github.sha }}
+
       - uses: actions/checkout@v3
 
       - uses: docker/login-action@v2
@@ -34,8 +40,13 @@ jobs:
 
       - name: Build Solid-Nextcloud Docker image
         run: |
-          docker build -t "ghcr.io/pdsinterop/solid-nextcloud:${{ github.sha }}" .
+          docker build \
+            --tag "solid-nextcloud:${{ github.sha }}" \
+            --tag "ghcr.io/pdsinterop/solid-nextcloud:${{ github.sha }}" \
+          .
           docker push "ghcr.io/pdsinterop/solid-nextcloud:${{ github.sha }}"
+          mkdir -p cache/solid-nextcloud
+          docker image save solid-nextcloud:${{ github.sha }} --output ./cache/solid-nextcloud/${{ github.sha }}.tar
 
   solid-testsuite:
     strategy:
@@ -54,6 +65,12 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - uses: actions/cache@v3
+        id: cache-solid-nextcloud-docker
+        with:
+          path: cache/solid-nextcloud
+          key: solid-nextcloud-docker-${{ github.sha }}
+
       - uses: docker/login-action@v2
         with:
           registry: ghcr.io
@@ -62,9 +79,9 @@ jobs:
 
       - name: Pull docker Images
         run: |
+          docker image load --input ./cache/solid-nextcloud/${{ github.sha }}.tar
           docker pull michielbdejong/nextcloud-cookie:${{ env.COOKIE_TAG }}
           docker pull ${{ matrix.test }}
-          docker pull ghcr.io/pdsinterop/solid-nextcloud:${{ github.sha }}
           docker pull ghcr.io/pdsinterop/php-solid-pubsub-server:${{ env.PUBSUB_TAG }}
 
       - name: Start Docker Containers
@@ -78,8 +95,8 @@ jobs:
             "ghcr.io/pdsinterop/php-solid-pubsub-server:${{ env.PUBSUB_TAG }}"
 
           source ./run-solid-test-suite.sh
-          startSolidNextcloud 'server' "ghcr.io/pdsinterop/solid-nextcloud:${{ github.sha }}" ${{ matrix.test }}
-          startSolidNextcloud 'thirdparty' "ghcr.io/pdsinterop/solid-nextcloud:${{ github.sha }}" ${{ matrix.test }}
+          startSolidNextcloud 'server' "solid-nextcloud:${{ github.sha }}" ${{ matrix.test }}
+          startSolidNextcloud 'thirdparty' "solid-nextcloud:${{ github.sha }}" ${{ matrix.test }}
 
           echo "COOKIE_server=${COOKIE_server}" >> "${GITHUB_ENV}"
           echo "COOKIE_thirdparty=${COOKIE_thirdparty}" >> "${GITHUB_ENV}"