fix(tests): update database connection strings for CI

* Use dynamic host and port for Postgres in tests
* Add helper functions for test database host and port

tests/integration/rls_test.go

@@ -3,6 +3,7 @@ package integration
 import (
 	"context"
 	"database/sql"
+	"fmt"
 	"testing"
 
 	_ "github.com/lib/pq"
@@ -47,7 +48,7 @@ func TestRLSTenantIsolation(t *testing.T) {
 	}
 
 	runtimeDB, err := sql.Open("postgres",
-		"user=test_broker_runtime password=test-pass dbname=broker_test host=127.0.0.1 port=5433 sslmode=disable options='-c search_path=broker,public'")
+		fmt.Sprintf("user=test_broker_runtime password=test-pass dbname=broker_test host=%s port=%d sslmode=disable options='-c search_path=broker,public'", testDBHost(), testDBPort()))
 	require.NoError(t, err)
 	defer runtimeDB.Close()
 	require.NoError(t, runtimeDB.Ping())