feature: publish container image to GHCR (#409)

* feat: publish container image to GHCR

Fixes: #408

* add permissions to workflow

.github/workflows/docker.yml

@@ -6,6 +6,9 @@ on:
 jobs:
   buildx:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -38,6 +41,12 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_TOKEN }}
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push base-image
         uses: docker/build-push-action@v5
         with:
@@ -48,6 +57,8 @@ jobs:
           tags: |
             coderaiser/cloudcmd:latest
             coderaiser/cloudcmd:${{ steps.build.outputs.version }}
+            ghcr.io/${{ github.repository }}:latest
+            ghcr.io/${{ github.repository }}:${{ steps.build.outputs.version }}
       - name: Build and push alpine-image
         uses: docker/build-push-action@v5
         with:
@@ -58,3 +69,5 @@ jobs:
           tags: |
             coderaiser/cloudcmd:latest-alpine
             coderaiser/cloudcmd:${{ steps.build.outputs.version }}-alpine
+            ghcr.io/${{ github.repository }}:latest-alpine
+            ghcr.io/${{ github.repository }}:${{ steps.build.outputs.version }}-alpine