test: simplify postgres sqlness startup wait

tests/runner/src/util.rs

@@ -352,36 +352,8 @@ pub fn setup_pg(pg_port: u16, pg_version: Option<&str>) {
         }
     }
 
-    // Wait until PostgreSQL is ready to accept connections. The container
-    // accepts TCP connections before the database system has finished
-    // initializing, so a plain TCP port check is not sufficient. Use
-    // `pg_isready` (bundled in the official postgres image) instead.
-    wait_for_pg_ready("greptimedb_pg", pg_user, Duration::from_secs(60));
-}
-
-/// Poll `pg_isready` inside the named container until it reports that the
-/// server is accepting connections, or until `timeout` is reached.
-fn wait_for_pg_ready(container_name: &str, user: &str, timeout: Duration) {
-    let deadline = std::time::Instant::now() + timeout;
-    println!("Waiting for PostgreSQL container \"{container_name}\" to be ready...");
-    loop {
-        let ready = std::process::Command::new("docker")
-            .args(["exec", container_name, "pg_isready", "-U", user])
-            .status()
-            .map(|s| s.success())
-            .unwrap_or(false);
-        if ready {
-            println!("PostgreSQL is ready");
-            return;
-        }
-        if std::time::Instant::now() >= deadline {
-            panic!(
-                "PostgreSQL container \"{container_name}\" did not become ready within {:?}",
-                timeout
-            );
-        }
-        std::thread::sleep(Duration::from_millis(500));
-    }
+    // Docker of PostgreSQL starts slowly, so we need to wait for a while.
+    std::thread::sleep(Duration::from_secs(10));
 }
 
 /// Set up a MySql server in docker.