Improve bash readability

.github/workflows/ci.yml

@@ -18,7 +18,9 @@ jobs:
         run: |
           mkdir -p images
           images=$(docker images lukechilds/dockerpi --format "{{.Repository}}:{{.Tag}}")
-          for image in $images; do docker save $image | gzip > "images/$(echo $image |  tr '/' '-').tgz"; done
+          for image in $images; do
+            docker save $image | gzip > "images/$(echo $image |  tr '/' '-').tgz"
+          done
       - name: Print sha256sum of built image
         run: sha256sum images/*
       - name: Upload image tarballs