Merge pull request #519 from nginx-proxy/dependabot-gh-actions

ci: add GitHub Actions to Dependabot config

Author: buchdag

.github/dependabot.yml

@@ -8,11 +8,18 @@ updates:
     commit-message:
       prefix: "build"
 
-
   # Maintain dependencies for Docker
   - package-ecosystem: "docker"
     directory: "/"
     schedule:
       interval: "daily"
     commit-message:
       prefix: "build"
+
+  # Maintain GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "ci"