ci: reuse docker image in e2e matrix jobs

.github/workflows/plugins.yml

@@ -8,6 +8,30 @@ on:
   pull_request:
 
 jobs:
+  build:
+    name: Build docker image once and share it to E2E jobs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          tags: ghcr.io/acouvreur/sablier:local
+          outputs: type=docker,dest=/tmp/sablier.tar
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: sablier-image-tar
+          path: /tmp/sablier.tar
+
   traefik:
     name: Build Sablier for Traefik middleware
     runs-on: ubuntu-latest
@@ -29,6 +53,7 @@ jobs:
   traefik_e2e:
     name: Run Sablier E2E tests for Traefik middleware
     runs-on: ubuntu-latest
+    needs: build
     strategy:
       fail-fast: false
       matrix:
@@ -42,22 +67,17 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
+
+      - name: Download artifact
+        uses: actions/download-artifact@v2
         with:
-          version: latest
+          name: sablier-image-tar
-          buildkitd-flags: --debug
+          path: /tmp
-      -
+          
-        name: Build and push
+      - name: Load Docker image
-        id: docker_build
+        run: docker load --input /tmp/sablier.tar
-        uses: docker/build-push-action@v2
-        with:
-          load: true
-          context: .
-          tags: ghcr.io/acouvreur/sablier:local
 
       - name: Test ${{ matrix.provider }}
         run: cd plugins/traefik/e2e && bash ./${{ matrix.provider }}.sh