fix: standardize quotes in workflow configuration

Author: MichaelKreil

.github/workflows/docker.yml

@@ -3,7 +3,7 @@ name: Build Docker Image
 on:
   workflow_dispatch:
   workflow_run:
-    workflows: ["CI"]
+    workflows: ['CI']
     types:
       - completed
 
@@ -31,4 +31,4 @@ jobs:
           context: .
           file: docker/Dockerfile
           push: true
-          tags: ghcr.io/${{ github.repository }}:latest
+          tags: ghcr.io/${{ github.repository }}:latest