Add changesets check action for missing changesets

.changeset/gold-geese-gaze.md

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+---
+"cicd-changesets-check": minor
+---
+
+Initial version of changesets-check action

actions/cicd-changesets-check/LICENSE

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+MIT License
+
+Copyright (c) 2019 changesets contributors Copyright (c) 2025 Smartcontractkit
+
+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.

actions/cicd-changesets-check/README.md

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+# cicd-changesets-check
+
+Comments on PRs with whether a PR has a changeset or not and links to
+documentation explaining to contributors how to create a changeset.
+
+Based on [changesets/check-action](https://github.com/changesets/check-action)
+(MIT, © changesets contributors).
+
+## Usage
+
+```yaml
+name: Changeset Check
+
+on: pull_request
+
+jobs:
+  check:
+    name: Changeset Check
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v6
+      - name: Check for changeset
+        uses: smartcontractkit/.github/actions/cicd-changesets-check@<version>
+        with:
+          token: ${{ github.token }}
+```
+
+## Inputs
+
+| Name              | Description                                     | Required | Default               |
+| ----------------- | ----------------------------------------------- | -------- | --------------------- |
+| `token`           | GitHub token for API access                     | Yes      | `${{ github.token }}` |
+| `fail-on-missing` | Fail the workflow if no changeset is found      | No       | `"true"`              |
+| `show-add-link`   | Show the 'add a changeset' link for maintainers | No       | `"true"`              |
+
+## Outputs
+
+| Name            | Description                                 |
+| --------------- | ------------------------------------------- |
+| `has-changeset` | Whether the PR has a changeset (true/false) |
+
+## Development
+
+1. Update dist: `pnpm nx run cicd-changesets-check:build`
+2. Run tests: `pnpm nx run cicd-changesets-check:test`

actions/cicd-changesets-check/action.yml

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+name: cicd-changesets-check
+description: >
+  Comments on PRs with whether a PR has a changeset or not and links to
+  documentation explaining to contributors how to create a changeset.
+
+inputs:
+  token:
+    description: "GitHub token for API access"
+    required: true
+    default: ${{ github.token }}
+  fail-on-missing:
+    description: "Fail the workflow if no changeset is found"
+    required: false
+    default: "true"
+  show-add-link:
+    description: "Show the 'add a changeset' link for maintainers"
+    required: false
+    default: "true"
+
+outputs:
+  has-changeset:
+    description: "Whether the PR has a changeset (true/false)"
+
+runs:
+  using: "node24"
+  main: "dist/index.js"