First implementation

Author: lultimouomo

.gitignore

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+node_modules/
+.idea/

LICENSE

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+MIT License
+
+Copyright (c) 2023 castLabs GmbH
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Input Parameters Action
+
+This action provides a uniform interface for job input parameters whether the
+job has been triggerered from a `workflow_dispatch` event or from a 
+`pull_request_review_comment`event. In the latter case, input parameters must
+be provided JSON-formatted in the review comment body, after a configurable
+prefix.
+
+The parameters are exposed as outputs, together with `valid-trigger` true/false
+string that will be true unless the job was triggered from a review comment that
+does not start with the configured prefix.
+
+## Inputs
+
+| Name             | Description                                                                                                                                                       |
+|------------------|----------------------------------------------------------------|
+| `line-prefix` | A previx that will identify a comment as triggering a workflow |
+
+
+## Outputs
+
+| Name            | Description                   |
+|-----------------|-------------------------------|
+| `*`             | The other input parameters    |
+
+## Example usage
+
+```
+on:
+  workflow_dispatch:
+     inputs:
+      clean-workspace:
+        description: 'Cleans the workspace before git checkout'
+        type: boolean
+        required: false
+...
+- uses: castlabs/[email protected]
+  id: parameters
+  with:
+    line-prefix: '/workflow'
+
+- name: Clean workspace
+  if: ${{ steps.parameters.outputs.clean-workspace == 'true' }}
+  run: rm -rf *

action.yml

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+name: Extract input parameters from manual trigger or pull request body
+description: |
+  This action provides a uniform interface for job input parameters whether the
+  job has been triggerered from a `workflow_dispatch` event or from a 
+  `pull_request` event. In the latter case, input parameters must be provided
+  JSON-formatted in the PR text, in a line starting with a configurable prefix.
+  The parameters are exposed as outputs.
+
+inputs:
+  line-prefix:
+    description: A prefix that will mark the PR text line containing inputs.
+    required: false
+    default: '/workflow'
+
+runs:
+  using: 'node16'
+  main: 'dist/index.js'