Update docker build and push workflow

.github/workflows/docker.yml

@@ -1,58 +1,45 @@
 name: Docker
 
+# This workflow is triggered on a push to a tag that follows semantic versioning
+# e.g., v1.2.3, v2.0.0-rc1
 on:
   push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+**'
 
 jobs:
-  # Set variables that will be available to all builds.
-  env_vars:
+  # Build and push the Docker image
+  build-and-push:
     runs-on: ubuntu-latest
-    outputs:
-      release_version: ${{ steps.release_version.outputs.release_version }}
-      binary: ${{ steps.binary.outputs.binary }}
     steps:
-      - id: release_version
-        run: |
-          RELEASE_VERSION=$(echo ${{ github.ref_name }} | sed -e 's/^[vt]//')
-          echo "release_version=${RELEASE_VERSION}" >> $GITHUB_OUTPUT
-      - id: binary
-        run: |
-          BINARY=$(basename ${{ github.repository }})
-          echo "binary=${BINARY}" >> $GITHUB_OUTPUT
+      - name: Check out repository
+        uses: actions/checkout@v4
 
-  # Build.
-  build:
-    runs-on: ubuntu-latest
-    needs: [env_vars]
-    steps:
-      - name: Check out repository into the Go module directory
-        uses: actions/checkout@v3
+      # This step extracts the version number from the tag
+      # e.g., if the tag is 'v1.2.3', this will output '1.2.3'
+      - name: Extract release version
+        id: release_version
+        run: |
+          echo "version=$(echo ${{ github.ref_name }} | sed -e 's/^v//')" >> $GITHUB_OUTPUT
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v4
-        with:
-          context: .
-          platforms: linux/amd64,linux/arm64/v8
-          push: true
-          tags: wealdtech/ethdo:latest
-
-      - name: build and push on release
-        uses: docker/build-push-action@v4
-        if: ${{ github.event.release.tag_name != '' }}
+        uses: docker/build-push-action@v5
         with:
           context: .
           platforms: linux/amd64,linux/arm64/v8
           push: true
-          tags: wealdtech/ethdo:${{ github.event.release.tag_name }}
+          tags: |
+            wealdtech/ethdo:${{ steps.release_version.outputs.version }}
+            wealdtech/ethdo:latest