Add AI_PROVIDER and AI_MODEL support

tools/ai-review/config.yml

@@ -4,8 +4,11 @@
 # LLM Provider Configuration
 # --------------------------
 # Available providers: openai | openrouter | ollama | anthropic | azure | gemini
+# This value can be overridden by setting the AI_PROVIDER Gitea secret.
 provider: openai
 
+# The model to use per provider.
+# Override the active provider's model by setting the AI_MODEL Gitea secret.
 model:
   openai: gpt-4.1-mini
   openrouter: anthropic/claude-3.5-sonnet

tools/ai-review/main.py

@@ -332,6 +332,18 @@ def main():
     setup_logging(args.verbose)
     config = load_config(args.config)
 
+    # Allow overriding the provider via a Gitea/CI secret (AI_PROVIDER env var)
+    ai_provider = os.environ.get("AI_PROVIDER")
+    if ai_provider:
+        config["provider"] = ai_provider
+
+    # Allow overriding the model via a Gitea/CI secret (AI_MODEL env var)
+    # Overrides the model for whichever provider is active.
+    ai_model = os.environ.get("AI_MODEL")
+    if ai_model:
+        provider = config.get("provider", "openai")
+        config.setdefault("model", {})[provider] = ai_model
+
     if args.command == "pr":
         run_pr_review(args, config)
     elif args.command == "issue":