Tag newest docker image built from master as "latest".

Fixes issue #122.

.github/workflows/docker_build.yml

@@ -18,32 +18,35 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       -
         name: Docker meta
         id: docker_meta
-        uses: crazy-max/ghaction-docker-meta@v1
+        uses: docker/metadata-action@v4
         with:
           # list of Docker images to use as base name for tags
           images: |
             jbtronics/part-db1
+          # Mark the image build from master as latest (as we dont have really releases yet)
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
       -
         name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v2
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
       -
         name: Login to DockerHub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       -
         name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v3
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}