feat(ci): Implement orchestrator workflow for unified build and test

.github/workflows/build-and-publish.yml

@@ -0,0 +1,52 @@
+# .github/workflows/build-and-publish.yml
+name: 'Build and Publish Bundle'
+
+on:
+  workflow_call:
+    outputs:
+      tag:
+        description: "The tag of the published package"
+        value: ${{ jobs.publish-bundle.outputs.tag }}
+
+jobs:
+  publish-bundle:
+    name: 'Publish Bundle'
+    runs-on: 'gemini-cli-ubuntu-16-core'
+    outputs:
+      tag: ${{ steps.get_tag.outputs.tag }}
+    permissions:
+      contents: 'read'
+      packages: 'write'
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8' # ratchet:actions/checkout@v5
+        with:
+          ref: '${{ github.event.inputs.branch_ref || github.ref }}'
+          fetch-depth: 0
+
+      - name: 'Set up Node.js'
+        uses: 'actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020' # ratchet:actions/setup-node@v4.4.0
+        with:
+          node-version-file: '.nvmrc'
+          cache: 'npm'
+
+      - name: 'Install dependencies'
+        run: 'npm ci'
+
+      - name: 'Configure npm for GitHub Packages'
+        run: |
+          echo "@google-gemini:registry=https://npm.pkg.github.com/" > .npmrc
+          echo "//npm.pkg.github.com/:_authToken=${{ secrets.GITHUB_TOKEN }}" >> .npmrc
+
+      - name: 'Prepare for GitHub release'
+        run: 'node scripts/prepare-github-release.js'
+
+      - name: 'Bundle'
+        run: 'npm run bundle'
+
+      - name: 'Get tag'
+        id: get_tag
+        run: echo "tag=ci-${{ github.sha }}" >> $GITHUB_OUTPUT
+
+      - name: 'Publish to GitHub Packages'
+        run: 'npm publish --tag=${{ steps.get_tag.outputs.tag }}'