Switch to Changesets-based release process (#118)

* Switch to Changesets-based release process

* Bump version

* drop unused variable

* Update .github/workflows/version-or-publish.yml

Co-authored-by: Nicola Molinari <nicola.molinari@commercetools.com>

* Push also to a release line branch when releasing

* Change node version used in the version-or-publish workflow

* Switch to using the local action

Co-authored-by: Nicola Molinari <nicola.molinari@commercetools.com>

* build the action before trying to use it the workflow

* Add changeset and actually setup Changesets, lol

Co-authored-by: Nicola Molinari <nicola.molinari@commercetools.com>

.github/workflows/version-or-publish.yml

@@ -0,0 +1,33 @@
+name: Version or Publish
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  changesets:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+
+      - name: Use Node.js 14
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
+
+      - name: Install Dependencies
+        run: yarn --frozen-lockfile
+
+      - name: Build
+        run: yarn build
+
+      - name: Create Release Pull Request or Publish
+        id: changesets
+        uses: .
+        with:
+          version: yarn version
+          publish: yarn release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}