gitlab-container-registry: disable flaky test

pkgs/by-name/gi/gitlab-container-registry/package.nix

@@ -19,11 +19,18 @@ buildGoModule rec {
 
   vendorHash = "sha256-I/umXgVm9a+0Ay3ARuaa4Dua4Zhc5p2TONHvhCt3Qtk=";
 
-  checkFlags = [
-    # TestHTTPChecker requires internet
-    # TestS3DriverPathStyle requires s3 credentials/urls
-    "-skip TestHTTPChecker|TestS3DriverPathStyle"
-  ];
+  checkFlags =
+    let
+      skippedTests = [
+        # requires internet
+        "TestHTTPChecker"
+        # requires s3 credentials/urls
+        "TestS3DriverPathStyle"
+        # flaky
+        "TestPurgeAll"
+      ];
+    in
+    [ "-skip=^${builtins.concatStringsSep "$|^" skippedTests}$" ];
 
   meta = with lib; {
     description = "GitLab Docker toolset to pack, ship, store, and deliver content";