Update docker build to use the GitHub container registry

Author: robertt

.github/workflows/main.yml

@@ -17,39 +17,34 @@ jobs:
               uses: actions/setup-node@v1
               with:
                   node-version: 12
+
             - name: yarn install
               run: yarn install
             - name: build
               run: yarn run build
             - name: lint
               run: yarn run lint
-            - name: Build image
+ 
+            - name: Set up Docker Buildx
               if: contains(github.ref, 'master')
-              run: docker build . --file Dockerfile --tag $IMAGE_NAME
-
-            - name: Log into registry
+              uses: docker/setup-buildx-action@v1
+  
+            - name: Login to Github Container Registry
               if: contains(github.ref, 'master')
-              run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin
-
-            - name: Push image
+              uses: docker/login-action@v1
+              with:
+                registry: ghcr.io
+                username: ${{ github.repository_owner }}
+                password: ${{ secrets.GHCR_TOKEN  }}
+  
+            - name: Build and push
               if: contains(github.ref, 'master')
-              run: |
-                  IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME
-
-                  # Change all uppercase to lowercase
-                  IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
-
-                  # Strip git ref prefix from version
-                  VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
-
-                  # Strip "v" prefix from tag name
-                  [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
-
-                  # Use Docker `latest` tag convention
-                  [ "$VERSION" == "master" ] && VERSION=latest
-
-                  echo IMAGE_ID=$IMAGE_ID
-                  echo VERSION=$VERSION
-
-                  docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
-                  docker push $IMAGE_ID:$VERSION
+              uses: docker/build-push-action@v2
+              with:
+                context: .
+                file: ./Dockerfile
+                push: true
+                cache-from: type=registry,ref=ghcr.io/typescript-community/bot:latest
+                cache-to: type=inline
+                tags: |
+                    ghcr.io/typescript-community/bot:latest