Build the Dockerfile on pull requests

.github/workflows/pr.yml

@@ -17,6 +17,7 @@ jobs:
     - uses: actions/checkout@v3
     - name: build binary
       run: |
+        docker build . -f Dockerfile -t tmp
         docker build . -f Dockerfile.buildlocal -t builder
         docker run --rm -v ${PWD}:/project builder make
     - uses: actions/upload-artifact@master