fix(auth): expose port and require PostgreSQL 15 for migrations

- Add expose_ports() implementation to Auth Image trait to expose port 9999
- Update integration tests to use PostgreSQL 15-alpine (migrations require
  PostgreSQL 12+ for GENERATED ALWAYS AS ... STORED columns syntax)
- Import ImageExt trait for with_tag() method

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: j7nw4r

src/auth.rs

@@ -66,7 +66,9 @@ use std::borrow::Cow;
 use std::collections::BTreeMap;
 
 use anyhow::{bail, Context};
-use testcontainers_modules::testcontainers::core::{ContainerState, ExecCommand, WaitFor};
+use testcontainers_modules::testcontainers::core::{
+    ContainerPort, ContainerState, ExecCommand, WaitFor,
+};
 use testcontainers_modules::testcontainers::{Image, TestcontainersError};
 use tokio_postgres::NoTls;
 
@@ -337,6 +339,11 @@ impl Image for Auth {
         vec![WaitFor::message_on_stderr("API started")]
     }
 
+    /// Returns the ports to expose from the container
+    fn expose_ports(&self) -> &[ContainerPort] {
+        &[ContainerPort::Tcp(AUTH_PORT)]
+    }
+
     /// Returns the environment variables to be passed to the container
     fn env_vars(
         &self,

tests/auth_integration.rs

@@ -6,7 +6,7 @@
 use anyhow::Result;
 use supabase_testcontainers_modules::{Auth, AUTH_PORT, DOCKER_INTERNAL_HOST, LOCAL_HOST};
 use testcontainers::runners::AsyncRunner;
-use testcontainers::ContainerAsync;
+use testcontainers::{ContainerAsync, ImageExt};
 use testcontainers_modules::postgres::Postgres;
 use tokio_postgres::NoTls;
 
@@ -28,7 +28,7 @@ pub struct AuthTestContext {
 /// Sets up PostgreSQL and Auth containers for integration testing.
 ///
 /// This function:
-/// 1. Starts a PostgreSQL container with host authentication
+/// 1. Starts a PostgreSQL 15 container (required for Auth migrations)
 /// 2. Initializes the auth database schema
 /// 3. Starts the Auth container connected to PostgreSQL
 ///
@@ -42,8 +42,8 @@ pub struct AuthTestContext {
 /// // Containers are automatically stopped when ctx goes out of scope
 /// ```
 pub async fn setup_auth_with_postgres() -> Result<AuthTestContext> {
-    // Start PostgreSQL container
-    let postgres = Postgres::default().start().await?;
+    // Start PostgreSQL 15 container (Auth migrations require PostgreSQL 12+ for generated columns)
+    let postgres = Postgres::default().with_tag("15-alpine").start().await?;
     let postgres_port = postgres.get_host_port_ipv4(POSTGRES_PORT).await?;
 
     // Connection string for Auth container (uses docker internal host)
@@ -180,8 +180,8 @@ mod tests {
     /// Test that signup is rejected when disabled
     #[tokio::test]
     async fn test_signup_rejected_when_disabled() -> Result<()> {
-        // Start PostgreSQL container
-        let postgres = Postgres::default().start().await?;
+        // Start PostgreSQL 15 container (Auth migrations require PostgreSQL 12+)
+        let postgres = Postgres::default().with_tag("15-alpine").start().await?;
         let postgres_port = postgres.get_host_port_ipv4(POSTGRES_PORT).await?;
 
         let auth_db_url = format!(