Add a way to opt out of automatic deploys

[ljodal]

We should have some easy way of opting out of automatic deploys, for example by having an argument to the workflow that disables it. Once it has been deployed manually the workflow can re re-enabled in a new commit.

[thor]

⚠️ This issue needs additional triaging or it will be closed within the next few weeks. ⚠️

In particular, this issue needs issue type labels.

The issue should be labeled with either

• for additional features or use-cases,
• for smaller user-visible improvements,
• for issues relating to technical debt or refactoring, and
• for errors in behaviour as experienced by us or users.

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For more information please see https://github.com/kolonialno/cloud-platform-tasks/issues/401.