changed build file to accept containerfiles

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Get Dockerfile image name
         id: get_image_name
         run: |
-          IMAGE_NAME=$(grep -Po '(?<=name=")[^"]*' Dockerfile)
+          IMAGE_NAME=$(grep -Po '(?<=name=")[^"]*' Containerfile)
           echo "::set-output name=image_name::$IMAGE_NAME"
 
       - name: Login to container registry
@@ -26,7 +26,7 @@ jobs:
       - name: Check for Dockerfile changes
         id: dockerfile_changed
         run: |
-          if git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep '^Dockerfile$'; then
+          if git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep '^Containerfile$'; then
             echo "::set-output name=changed::true"
           else
             echo "::set-output name=changed::false"