Bump docker/build-push-action from 2.7.0 to 2.8.0 (#68)

Author: dependabot[bot]

.github/workflows/build.yml

@@ -64,7 +64,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.8.0
         with:
           context: .
           file: ./Dockerfile