Add OWN_PRIVATE_API_URL env variable for GitLab KAS

In GitLab 17.8.0, GitLab agent server for Kubernetes (KAS) does not start with the
default settings on the GitLab Linux package (Omnibus) and Docker installations.

Signed-off-by: Norman Ziegner <[email protected]>

Author: Normo

molecule/gitlab/molecule.yml

@@ -36,6 +36,10 @@ provisioner:
               - key: "modify_kernel_parameters"
                 type: "plain"
                 value: "false"
+          - gitlab_kas:
+              - key: "env"
+                type: "plain"
+                value: "{ 'OWN_PRIVATE_API_URL' => 'grpc://127.0.0.1:8155' }"
         gitlab_feature_flags:
           # See https://docs.gitlab.com/ee/user/feature_flags.html
           - name: "vscode_web_ide"