Update Docker build workflow for improved tagging

.github/workflows/docker-build.yml

@@ -2,11 +2,14 @@ name: Build and Publish Docker Image
 
 on:
   push:
-    branches: [ "main" ]
-    tags: [ "v*" ]
+    branches:
+      - main
+    tags:
+      - "v*"
   pull_request:
 
 env:
+  REGISTRY: ghcr.io
   IMAGE_NAME: meshcore-multitcp
 
 jobs:
@@ -18,30 +21,36 @@ jobs:
       packages: write
 
     steps:
-      - name: Checkout repo
+      - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Log in to GitHub Container Registry
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
         uses: docker/login-action@v3
         with:
-          registry: ghcr.io
+          registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract metadata (tags, labels)
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ghcr.io/${{ github.repository_owner }}/meshcore-multitcp
-          tags: |
-            type=ref,event=branch
-            type=ref,event=tag
-            type=sha
-            type=raw,value=latest,enable={{is_default_branch}}
+      - name: Determine image tags
+        id: vars
+        shell: bash
+        run: |
+          if [[ "${GITHUB_REF}" == refs/tags/* ]]; then
+            TAG="${GITHUB_REF#refs/tags/}"
+            echo "tags=${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:${TAG}" >> "$GITHUB_OUTPUT"
+          else
+            echo "tags=${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:latest" >> "$GITHUB_OUTPUT"
+          fi
+          echo "sha_tag=${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:sha-${GITHUB_SHA::7}" >> "$GITHUB_OUTPUT"
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+      - name: Build and push
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true
-          tags: ${{ steps.meta.outputs.tag
+          tags: |
+            ${{ steps.vars.outputs.tags }}
+            ${{ steps.vars.outputs.sha_tag }}