Merge pull request #36 from dchesterton/dependabot/github_actions/docker/build-push-action-2.7.0

[ci skip]: Bump docker/build-push-action from 2.6.1 to 2.7.0

.github/workflows/publish.yml

@@ -37,7 +37,7 @@ jobs:
                   username: ${{ secrets.DOCKER_USERNAME }}
                   password: ${{ secrets.DOCKER_PASSWORD }}
             - name: Build and push
-              uses: docker/build-push-action@v2.6.1
+              uses: docker/build-push-action@v2.7.0
               with:
                   context: .
                   push: true