1597 Add Watchtower lable to automatically update nginx image

Related ticket(s):

Closes:

Other(s):

• https://gitlab.e.foundation/e/infra/backlog/-/issues/1597
• subtask##1837

Related MR(s):

• https://gitlab.e.foundation/e/infra/monitoring/uptime-kuma/-/merge_requests/8

Summary:

This MR adds a label to automatically update nginx image with watchtower.

⚠ It seems we use docker-compose.prod.yml for staging deployment as well, thus changes are made in docker-compose.prod.yml

Change list:

• c81273a6 add label to auto update nginx image with watchtower

To Do:

Steps to deploy:

Links for testing:

Steps to validate

• nginx image hash should auto update in staging from current one with 6efc10a0510f

Checklist:

• Lint check
• CI updates if any
• Deployed and tested in staging
• Documentation update if required