Update docker.yml (#87)

Build:
Adjust Docker workflow triggers to use the main branch name for push and pull request events.
Signed-off-by: Dargon789 <64915515+Dargon789@users.noreply.github.com>

Author: Dargon789

.github/workflows/docker.yml

@@ -9,11 +9,11 @@ on:
   schedule:
     - cron: '21 12 * * *'
   push:
-    branches: [ "master" ]
+    branches: [ "main" ]
     # Publish semver tags as releases.
     tags: [ 'v*.*.*' ]
   pull_request:
-    branches: [ "master" ]
+    branches: [ "main" ]
 
 env:
   # Use docker.io for Docker Hub if empty