chore: fix docker build and push github action (#27)

bumps all actions to their latest version ans parse the tag before
pushing the image.

Author: ricardomaraschini

.github/workflows/release-prod.yaml

@@ -17,6 +17,9 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Extract tag name
+        run: echo "TAG_NAME=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
@@ -49,18 +52,18 @@ jobs:
             *.tgz
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and Publish HelmVM Builder Server image.
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           push: true
-          tags: ghcr.io/${{ github.repository }}:${{ github.ref }}
+          tags: ghcr.io/${{ github.repository }}:$TAG_NAME