chore: require changeset or label (#1428)

.github/workflows/require-changeset.yaml

@@ -0,0 +1,23 @@
+name: Require Either a Changeset or a Label 'No Changeset Needed'
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+jobs:
+  require-changeset-or-label:
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'No Changeset Needed') }}
+    runs-on: ubuntu-latest
+    env:
+      CI: true
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          # check out full history
+          fetch-depth: 0
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 20
+          cache: 'npm'
+      - run: npm ci
+      - name: Check for changeset
+        run: npx changeset status --since origin/main

CONTRIBUTING.md

@@ -31,7 +31,7 @@ Before submitting a pull request, please make sure the following is done:
 1. If you’ve fixed a bug or added code that should be tested, don't forget to add [tests](#tests)!
 1. Ensure the test suite passes (see the [Tests section](#tests) for more details).
 1. Format your code with prettier (`npm run prettier`).
-1. Each feat/fix PR should also contain a changeset (to create one, run `npx changeset`; if your changes are scoped to `packages/core` but also affect Redocly CLI behavior, please include the `@redocly/cli` package as well). Please describe what you've done in this PR using sentence case (you can refer to our [changelog](https://redocly.com/docs/cli/changelog/)). This produces a file in `.changeset` folder. Please commit this file along with your changes.
+1. Each feat/fix PR should also contain a changeset (to create one, run `npx changeset`; if your changes are scoped to `packages/core` but also affect Redocly CLI behavior, please include the `@redocly/cli` package as well). Please describe what you've done in this PR using sentence case (you can refer to our [changelog](https://redocly.com/docs/cli/changelog/)). This produces a file in `.changeset` folder. Please commit this file along with your changes. If the PR doesn't need a changeset (for example, it is a small change, or updates only documentation), add the 'No Changeset Needed' label to the PR.
 
 ## Development setup