refactor: update Docker publish workflow to support GitHub Container Registry

Author: productdevbook

.github/workflows/docker-publish.yml

@@ -8,8 +8,10 @@ on:
       - 'v*'
 
 env:
-  REGISTRY: docker.io
-  IMAGE_NAME: productdevbook/nitroping
+  DOCKERHUB_REGISTRY: docker.io
+  DOCKERHUB_IMAGE: productdevbook/nitroping
+  GHCR_REGISTRY: ghcr.io
+  GHCR_IMAGE: ${{ github.repository }}
 
 jobs:
   build-amd64:
@@ -31,11 +33,20 @@ jobs:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
 
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ env.GHCR_REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
     - name: Extract metadata
       id: meta
       uses: docker/metadata-action@v5
       with:
-        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+        images: |
+          ${{ env.DOCKERHUB_REGISTRY }}/${{ env.DOCKERHUB_IMAGE }}
+          ${{ env.GHCR_REGISTRY }}/${{ env.GHCR_IMAGE }}
         tags: |
           type=ref,event=branch,suffix=-amd64
           type=semver,pattern={{version}},suffix=-amd64
@@ -81,11 +92,20 @@ jobs:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
 
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ env.GHCR_REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
     - name: Extract metadata
       id: meta
       uses: docker/metadata-action@v5
       with:
-        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+        images: |
+          ${{ env.DOCKERHUB_REGISTRY }}/${{ env.DOCKERHUB_IMAGE }}
+          ${{ env.GHCR_REGISTRY }}/${{ env.GHCR_IMAGE }}
         tags: |
           type=ref,event=branch,suffix=-arm64
           type=semver,pattern={{version}},suffix=-arm64
@@ -129,21 +149,49 @@ jobs:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
 
-    - name: Extract metadata for manifest
-      id: meta
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ env.GHCR_REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata for Docker Hub
+      id: meta-dockerhub
       uses: docker/metadata-action@v5
       with:
-        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+        images: ${{ env.DOCKERHUB_REGISTRY }}/${{ env.DOCKERHUB_IMAGE }}
         tags: |
           type=ref,event=branch
           type=semver,pattern={{version}}
           type=semver,pattern={{major}}.{{minor}}
           type=semver,pattern={{major}}
           type=raw,value=latest,enable={{is_default_branch}}
 
-    - name: Create and push manifest
+    - name: Extract metadata for GHCR
+      id: meta-ghcr
+      uses: docker/metadata-action@v5
+      with:
+        images: ${{ env.GHCR_REGISTRY }}/${{ env.GHCR_IMAGE }}
+        tags: |
+          type=ref,event=branch
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}
+          type=semver,pattern={{major}}
+          type=raw,value=latest,enable={{is_default_branch}}
+
+    - name: Create and push Docker Hub manifest
+      run: |
+        for tag in ${{ steps.meta-dockerhub.outputs.tags }}; do
+          docker buildx imagetools create \
+            --tag ${tag} \
+            ${tag}-amd64 \
+            ${tag}-arm64
+        done
+
+    - name: Create and push GHCR manifest
       run: |
-        for tag in ${{ steps.meta.outputs.tags }}; do
+        for tag in ${{ steps.meta-ghcr.outputs.tags }}; do
           docker buildx imagetools create \
             --tag ${tag} \
             ${tag}-amd64 \