Changes publishing to use GHCR

Adds extra step to extract version tag

Author: c4deszes

.github/workflows/release.yml

@@ -11,16 +11,20 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: Log in to GitHub Docker Registry
+      - name: Log in to GitHub Container Registry
         uses: docker/login-action@v1
         with:
-          registry: docker.pkg.github.com
+          registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Get the tag name
+        run: echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
+
       - name: Build container image
         uses: docker/build-push-action@v2
         with:
           push: true
           tags: |
-            docker.pkg.github.com/${{ github.repository }}/image:${{ github.sha }}
+            ghcr.io/${{ github.repository }}:${{ github.sha }}
+            ghcr.io/${{ github.repository }}:${{ env.TAG }}