Update and simplify build process

.github/workflows/release.yml

@@ -0,0 +1,53 @@
+name: release
+on: [ push ]
+jobs:
+  release-to-github:
+    name: Release to GitHub
+    runs-on: ubuntu-latest
+    if: contains(github.ref, 'main')
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          ref: main
+
+      - name: Check if version has changed
+        uses: EndBug/version-check@v1
+        id: check
+
+      - name: Version update detected
+        if: steps.check.outputs.changed == 'true'
+        run: 'echo "Version change found! New version: ${{ steps.check.outputs.version }} (${{ steps.check.outputs.type }})"'
+
+      - name: Install dependencies
+        if: steps.check.outputs.changed == 'true'
+        run: npm install
+
+      - name: Build plugin zip
+        if: steps.check.outputs.changed == 'true'
+        run: npm run create-zip
+
+      - name: Create release
+        if: steps.check.outputs.changed == 'true'
+        uses: actions/create-release@v1
+        id: create_release
+        with:
+          draft: false
+          prerelease: false
+          release_name: ${{ steps.check.outputs.version }}
+          tag_name: ${{ github.ref }}
+          body_path: CHANGELOG.md
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+
+      - name: Upload artifact
+        if: steps.check.outputs.changed == 'true'
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./cognito-forms-${{ steps.check.outputs.version }}.zip
+          asset_name: cognito-forms-${{ steps.check.outputs.version }}.zip
+          asset_content_type: application/zip