whitespace [skip ci]

.github/workflows/build-and-push-images.yml

@@ -1,4 +1,5 @@
 name: build and push images
+
 on:
   push:
     branches: ['master']
@@ -6,6 +7,7 @@ on:
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest
+
     strategy:
       matrix:
         include:
@@ -14,6 +16,7 @@ jobs:
           - { postgres: 12, alpine: '3.12' }
           - { postgres: 13, alpine: '3.14' }
           - { postgres: 14, alpine: '3.15' }
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2