ci(release): add changesets to automatically manage releases

Author: giamir

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/[email protected]/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    { "repo": "StackExchange/axe-apca" }
+  ],
+  "commit": false,
+  "access": "public",
+  "baseBranch": "main"
+}

.changeset/red-socks-invent.md

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+---
+"axe-apca": patch
+---
+
+Initial release

.github/workflows/release.yml

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+name: Release
+
+on:
+  workflow_run:
+    workflows:
+      - CI
+    branches:
+      - main
+    types:
+      - completed
+
+jobs:
+  release:
+    name: Release
+    # run only if the CI workflow is successful
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: ⬇️ Checkout
+        uses: actions/checkout@v3
+        # make sure to checkout the commit that triggered the CI workflow
+        # (which is not necessarily the latest commit)
+        with:
+          ref: ${{ github.event.workflow_run.head_commit.id }}        
+
+      - name: ⎔ Setup node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 'lts/*'
+
+      - name: 🏗 Install and Build
+        run: |
+            npm ci
+            npm run build
+
+      - name: 🚀 Create/Update Release Pull Request or Publish to npm
+        id: changesets
+        uses: changesets/action@v1
+        with:
+          publish: npm publish
+          version: npm version
+          title: 'chore(new-release)'
+          commit: 'chore(new-release)'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_API_KEY }}
+
+# cancel the jobs if another workflow is kicked off for the same branch
+concurrency:
+    group: ${{ github.workflow }}-${{ github.ref }}
+    cancel-in-progress: true