Test publish step

.github/workflows/repo.yml

@@ -1,6 +1,9 @@
 name: Build & Test
 
-on: push
+on:
+  push:
+  pull_request:
+    types: [opened, synchronize]
 
 env:
   NODE_VERSION: 18.x
@@ -72,4 +75,36 @@ jobs:
       - name: Test
         uses: borales/actions-yarn@v4
         with:
-          cmd: test
+          cmd: test
+
+  publish:
+    if: ${{ github.event_name == 'pull_request' && (github.event.action == 'opened' || github.event.action == 'synchronize') }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Node.js ${{ env.NODE_VERSION }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: 'npm'
+
+      - name: Restore node modules from cache
+        uses: actions/cache@v3
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+      
+      - name: Prepare version for publish
+        id: prep
+        run: |
+          PR_NUMBER=$(echo ${{ github.event.number }})
+          CURRENT_VERSION=$(node -p "require('./package.json').version")
+          NEW_VERSION="${CURRENT_VERSION}-dev.${PR_NUMBER}.0"
+          echo "NEW_VERSION=$NEW_VERSION" >> $GITHUB_ENV
+
+      - name: Echo version for testing
+        run: |
+          echo "Version to publish: $NEW_VERSION"