feat(ci): add trial bundling workflow and setup action

.github/actions/setup-gemini/action.yml

@@ -0,0 +1,45 @@
+name: 'Setup Gemini CLI'
+description: 'Sets up the environment and either builds from source or uses a pre-built bundle.'
+
+inputs:
+  mode:
+    description: 'Setup mode: "source" (build from scratch) or "bundle" (use pre-built artifact)'
+    required: true
+    default: 'source'
+  bundle-artifact:
+    description: 'The name of the bundle artifact to download if mode is "bundle"'
+    required: false
+
+runs:
+  using: 'composite'
+  steps:
+    - name: 'Set up Node.js'
+      uses: 'actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020'
+      with:
+        node-version-file: '.nvmrc'
+        cache: 'npm'
+
+    - name: 'Install dependencies'
+      run: 'npm ci'
+      shell: 'bash'
+
+    - name: 'Build from source'
+      if: "${{ inputs.mode == 'source' }}"
+      run: 'npm run build'
+      shell: 'bash'
+
+    - name: 'Download Bundle Artifact'
+      if: "${{ inputs.mode == 'bundle' }}"
+      uses: 'actions/download-artifact@fa0b912c4d7dad43192612d645081918b6b3fb81' # v4
+      with:
+        name: '${{ inputs.bundle-artifact }}'
+        path: 'bundle'
+
+    - name: 'Post-bundle setup'
+      if: "${{ inputs.mode == 'bundle' }}"
+      run: |
+        # Ensure the bundle is ready for use
+        # In a real install, we might symlink bin/gemini to bundle/gemini.js
+        # For now, we just list it to verify it exists
+        ls -R bundle
+      shell: 'bash'

.github/workflows/ci-bundling-trial.yml

@@ -0,0 +1,49 @@
+name: 'Bundling Trial CI'
+
+on:
+  push:
+    branches:
+      - 'feat/ci-bundling-revamp'
+
+jobs:
+  build_bundle:
+    name: 'Build Bundle'
+    runs-on: 'gemini-cli-ubuntu-16-core'
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8'
+
+      - name: 'Set up Node'
+        uses: 'actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020'
+        with:
+          node-version-file: '.nvmrc'
+          cache: 'npm'
+
+      - name: 'Install & Build'
+        run: |
+          npm ci
+          npm run bundle
+
+      - name: 'Upload Bundle'
+        uses: 'actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02' # v4
+        with:
+          name: 'gemini-bundle'
+          path: 'bundle/'
+
+  test_with_bundle:
+    name: 'Test (Linux) - Bundled Trial'
+    needs: 'build_bundle'
+    runs-on: 'gemini-cli-ubuntu-16-core'
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8'
+
+      - name: 'Setup with Bundle'
+        uses: './.github/actions/setup-gemini'
+        with:
+          mode: 'bundle'
+          bundle-artifact: 'gemini-bundle'
+
+      - name: 'Run CLI Tests'
+        run: 'npm run test:ci --workspace "@google/gemini-cli"'
+        shell: 'bash'