[Iteration 1] Deploy heartbeats image

Proposal

1. Update CNG image to set new arguments:

• self_url from https:// + hostname --fqdn
• gitlab_url from ENV variable
• gitlab_secret similar to how gitaly uses global.shell.authToken.secret. We'll need to mount the file with secrets to a predefined path

2. Update the zoekt helm chart to allow configuring gitlab_secret & gitlab_url
3. Bump up the main helm chart version.
4. Set auth & gitlab_url in k8s-workloads for gstg and gprd. Please note that we should use internal URL.
5. Verify that zoekt_nodes table is populated with the shard information