Create main.yml

adding main.yml to support action.yml that was added.

.github/workflows/main.yml

@@ -0,0 +1,56 @@
+name: main
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+jobs:
+  build-and-test:
+    runs-on: ubuntu-22.04
+    name: Build and test
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          # Action runs: using: node20 as defined in
+          # https://github.com/cypress-io/github-action/blob/master/action.yml
+          # Node.js minor version is aligned to
+          # https://github.com/actions/runner/blob/main/src/Misc/externals.sh
+          node-version: 20.8.1
+      - run: npm ci
+      - run: npm run format
+      - run: npm run build
+      - run: npm test
+
+  release:
+    runs-on: ubuntu-22.04
+    name: release
+    needs: [build-and-test]
+    # only release from the master branch
+    # in parent repository, not in a fork
+    if: (github.ref == 'refs/heads/master') &&
+      (github.repository == 'cypress-io/github-action')
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - run: npm ci
+      # https://github.com/cycjimmy/semantic-release-action
+      - name: Semantic Release
+        uses: cycjimmy/semantic-release-action@v3
+        id: semantic
+        with:
+          branches: master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Push updates to branch for major version
+        # if there is a new version published, let's say v1.2.3
+        # then this step will update branch "v1" to this commit
+        # https://github.com/cypress-io/github-action/branches
+        if: steps.semantic.outputs.new_release_published == 'true'
+        run: 'git push https://x-access-token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git HEAD:refs/heads/v${{steps.semantic.outputs.new_release_major_version}}'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}