Update pr-action.yml

Author: myf5

.github/workflows/pr-action.yml

@@ -21,6 +21,8 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       # Runs a single command using the runners shell
       - name: Run a one-line script
@@ -47,7 +49,7 @@ jobs:
 
       # Docker login
       - name: docker login
-        run: docker login -u ${{ secrets.DOCKERHUB_USERNAME }}  -p ${{ secrets.DOCKERHUB_PASSWORD }}
+        run: echo "${{ secrets.DOCKERHUB_PASSWORD }}" | docker login -u ${{ secrets.DOCKERHUB_USERNAME }}  --password-stdin
 
 
       # Get docker tag