Support issue comments in GitHub Actions

action.yaml

@@ -5,4 +5,4 @@ branding:
   color: 'green'
 runs:
   using: 'docker'
-  image: 'Dockerfile.github_action_dockerhub'
+  image: 'Dockerfile.github_action'

pr_agent/settings/configuration.toml

@@ -11,6 +11,7 @@ ai_timeout=180
 max_description_tokens = 500
 max_commits_tokens = 500
 secret_provider="google_cloud_storage"
+cli_mode=false
 
 [pr_reviewer] # /review #
 require_focused_review=false