ci: lint and test only manual triggered. (#270)

This pull request makes a small update to the GitHub Actions workflow
configuration. The change removes the pull request trigger and a
conditional check for specific labels in the `lint-and-test.yml`
workflow. This means the workflow will no longer run automatically on
pull requests or skip runs based on labels, and will only be triggered
manually.

- Removed the `pull_request` trigger from
`.github/workflows/lint-and-test.yml`, so the workflow is now only
triggered by `workflow_dispatch` (manual runs).
- Removed the conditional label checks from the `changes` job, so it no
longer skips execution based on the presence of certain labels
(`prepare-release`, `refresh-locks`, `chart-bump`).

Author: a-klos

.github/workflows/lint-and-test.yml

@@ -1,9 +1,6 @@
 name: lint-and-test
 
 on:
-  pull_request:
-    branches:
-      - main
   workflow_dispatch:
 
 env:
@@ -12,12 +9,6 @@ env:
 
 jobs:
   changes:
-    if: >-
-      ${{
-        !contains(github.event.pull_request.labels.*.name, 'prepare-release') &&
-        !contains(github.event.pull_request.labels.*.name, 'refresh-locks') &&
-        !contains(github.event.pull_request.labels.*.name, 'chart-bump')
-      }}
     name: Detect Changes
     runs-on: ubuntu-latest
     outputs: