UI/UX: Apply Non-Empty Environment Variables

[HerHde]

Clear and concise description of the problem

When triggering a manual pipeline run in the web UI, I often forget to apply env vars with the + Add variable button, as I interpret it as adding another variable.

Suggested solution

• Apply all variables with non-empty variable names
• Add a new input line once the variable name is not empty
• Keep the variables editable
• Remove the + Add variable button

Example from GitLab:

Alternative

No response

Additional context

Might also be useful if my issue #3291 gets implemented

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 docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.