Update Docker token and add Master build (#54)

Author: mikhail-vl

.github/workflows/docker.yml

@@ -166,7 +166,7 @@ jobs:
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
-          password: ${{ secrets.CR_PAT }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
         id: docker_build
@@ -179,6 +179,19 @@ jobs:
           tags: ghcr.io/redisgrafana/redis-app:latest
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache
-          
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/arm
+          push: true
+          build-args: GRAFANA_VERSION=master
+          tags: ghcr.io/redisgrafana/redis-app:master
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}