CI: test against a Postgres service (embedded Postgres won't run as root)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/web/web_test.go

@@ -33,6 +33,11 @@ import (
 var dbURL string
 
 func TestMain(m *testing.M) {
+	// CI gives a Postgres of its own (embedded Postgres won't run as root, as CI jobs do).
+	if url := os.Getenv("T5DE_TEST_DB"); url != "" {
+		dbURL = url
+		os.Exit(m.Run())
+	}
 	dir, _ := os.MkdirTemp("", "t5de-hub-test")
 	cache := os.Getenv("T5DE_PG_CACHE")
 	if cache == "" {
@@ -104,7 +109,9 @@ func newHub(t *testing.T) *hub {
 		t.Fatal(err)
 	}
 	admin.Close(ctx)
-	st, err := store.Open(ctx, strings.Replace(dbURL, "/postgres?", "/"+db+"?", 1))
+	u, _ := url.Parse(dbURL)
+	u.Path = "/" + db
+	st, err := store.Open(ctx, u.String())
 	if err != nil {
 		t.Fatal(err)
 	}