ldap/auth: add tests for login regressions (#26327)

* ldap/auth: add tests for login regressions

Add tests to cover the regressions reported in
- https://github.com/hashicorp/vault/issues/26171
- https://github.com/hashicorp/vault/issues/26183

* fix tests; update image tag

helper/testhelpers/ldap/ldaphelper.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 
 	"github.com/hashicorp/cap/ldap"
+
 	"github.com/hashicorp/vault/sdk/helper/docker"
 	"github.com/hashicorp/vault/sdk/helper/ldaputil"
 )
@@ -23,12 +24,10 @@ func PrepareTestContainer(t *testing.T, version string) (cleanup func(), cfg *ld
 	}
 
 	runner, err := docker.NewServiceRunner(docker.RunOptions{
-		// Currently set to "michelvocks" until https://github.com/rroemhild/docker-test-openldap/pull/14
-		// has been merged.
-		ImageRepo:     "docker.mirror.hashicorp.services/michelvocks/docker-test-openldap",
+		ImageRepo:     "ghcr.io/rroemhild/docker-test-openldap",
 		ImageTag:      version,
 		ContainerName: "ldap",
-		Ports:         []string{"389/tcp"},
+		Ports:         []string{"10389/tcp"},
 		// Env:        []string{"LDAP_DEBUG_LEVEL=384"},
 	})
 	if err != nil {