chore: test baseimage docker after build by building SK release docke…

…r image without pushing it to registry (#1696)

.github/workflows/build-base-image.yml

@@ -11,27 +11,56 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
           username: signalkci
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: Login to ghcr.io
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GHCR_PAT }} # Personal access tokens (classic) with a scope of "write:packages" is needed to release ghcr.io package registry. 
-      - name: Build and push
+
+      - name: Build baseimages and push with test tag
+        uses: docker/build-push-action@v5
+        with:
+          file: ./docker/Dockerfile_base
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          push: true
+          tags: |
+            signalk/signalk-server-base:test
+            ghcr.io/signalk/signalk-server-base:test
+
+      - name: Modify Dockerfile_rel for testing
+        run: |
+          sed -i 's/:latest/:test/g' ./docker/Dockerfile_rel
+
+      - name: Build Signal K test dockers
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./docker/Dockerfile_rel
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          build-args: |
+            TAG=latest
+
+      - name: Push baseimages to registries with latest tag
         uses: docker/build-push-action@v5
         with:
+          context: .
           file: ./docker/Dockerfile_base
           platforms: linux/amd64,linux/arm/v7,linux/arm64
           push: true
           tags: |
             signalk/signalk-server-base:latest
-            ghcr.io/signalk/signalk-server-base:latest
+            ghcr.io/signalk/signalk-server-base:latest