feat: improve code quality

.env.example

@@ -1,14 +1,14 @@
 # debug
 APP_DEBUG_ENABLED=false
 
-# githup app (required)
+# github app (required)
 APP_GITHUB_APP_ID=123456
 APP_GITHUB_APP_PRIVATE_KEY_PATH=./.local/private-key.pem
 APP_GITHUB_INSTALLATION_ID=987654
 APP_GITHUB_ORG=cruxstack
 APP_GITHUB_WEBHOOK_SECRET=your-webhook-secret-here
 
-# githu pr compliance (optional)
+# github pr compliance (optional)
 APP_PR_COMPLIANCE_ENABLED=true
 APP_PR_MONITORED_BRANCHES=main,master
 
@@ -33,3 +33,6 @@ APP_SLACK_CHANNEL=C01234ABCDE
 
 # api gateway base path (optional, for lambda deployments with stage prefix)
 # APP_BASE_PATH=v1
+
+# server port (optional, for cmd/server only, default: 8080)
+# APP_PORT=8080

cmd/server/main.go

@@ -39,7 +39,7 @@ func main() {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", httpHandler)
 
-	port := os.Getenv("PORT")
+	port := os.Getenv("APP_PORT")
 	if port == "" {
 		port = "8080"
 	}