Deploy dialog: pick environment from a list

[rigrig]

Clear and concise description of the problem

I would like to pick a deployment environment from a list when pressing the deploy button, instead of having to type it in.

Suggested solution

• In the "Deploy" dialog, allow picking "Target deployment environment" from a list of all environments listed in the pipeline

Alternative

• On the repository settings page, add a "Deployment environments" input, for a "Comma-separated list of deployment environments"
• In the "Deploy" dialog, allow picking an option from the environments listed in the settings.

Additional context

I only have a single environment anyway, so needing to remember/look up what I called it and type that in feels kind of pointless.

Validations

• Checked that the feature isn't part of the next version already [https://woodpecker-ci.org/faq#which-version-of-woodpecker-should-i-use]
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[6543]

I think the "Alternative" is easyer to do, as we have the info already in DB, we just need an function in the "datastore" module and a rest endpoint backend whise ...

[rigrig]

Thanks, I was thinking too much about the implementation instead of just the desired result when I opened the issue, edited now.