Simplify builds by only having one docker/build-push-action

Author: benbz

.github/workflows/docker-publish.yml

@@ -51,12 +51,3 @@ jobs:
         push: ${{ github.event_name != 'pull_request' }}
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}
-      if: contains(github.ref_name, '/merge') == false
-
-    - name: Build and push Docker image for PR
-      uses: docker/build-push-action@v2
-      with:
-        push: ${{ github.event_name != 'pull_request' }}
-        tags: ${{ steps.meta.outputs.tags }}
-        labels: ${{ steps.meta.outputs.labels }}
-      if: contains(github.ref_name, '/merge')