Update docker-publish.yml

Clean up linter issues

Author: Herb McNew

.github/workflows/docker-publish.yml

@@ -1,3 +1,4 @@
+---
 name: Docker
 
 # This workflow uses actions that are not certified by GitHub.
@@ -9,11 +10,11 @@ on:
   schedule:
     - cron: '30 20 * * *'
   push:
-    branches: [ "main" ]
+    branches: ["main"]
     # Publish semver tags as releases.
-    tags: [ 'v*.*.*' ]
+    tags: ['v*.*.*']
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
 
 env:
   # Use docker.io for Docker Hub if empty