add issue triage using gemini cli (#2310)

.github/workflows/gemini-issue-triage.yml

@@ -0,0 +1,67 @@
+name: Gemini Issue Triage
+
+on:
+  issues:
+    types: [opened, reopened]
+
+jobs:
+  triage-issue:
+    if: github.event_name == 'issues'
+    permissions:
+      contents: read
+      issues: write
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.issue.number }}
+      cancel-in-progress: true
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate GitHub App Token
+        id: generate_token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.APP_ID }}
+          private-key: ${{ secrets.PRIVATE_KEY }}
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          token: ${{ steps.generate_token.outputs.token }}
+
+      - name: Run Gemini Issue Triage
+        uses: google-gemini/gemini-cli-action@main
+        env:
+          GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}
+        with:
+          GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}
+          prompt: |
+            You are an issue triage assistant for GitHub issues.
+            Your task is to analyze the issue and apply appropriate labels from the repository's list of available labels.
+
+            **IMPORTANT: Your only action should be to apply labels. Do not post any comments or modify any code.**
+
+            **Triage Workflow:**
+
+            1.  **Fetch Available Labels:**
+                - Execute the following shell command to get the list of all labels in the repository:
+                  `gh label list`
+
+            2.  **Analyze the Issue:**
+                - Based on the issue title, body, and any comments, determine the most appropriate labels.
+                - Consider the type of issue (e.g., `kind/bug`, `kind/enhancement`, `kind/documentation`), the area of the codebase it affects (e.g., `area/core`, `area/ux`, `area/tools`), and assess the priority if possible (e.g., `priority/p1`, `priority/p2`).
+
+            3.  **Apply Labels:**
+                - Use the `gh` command-line tool to add the selected labels to the issue.
+                - Example command: `gh issue edit ${{ github.event.issue.number }} --add-label "kind/bug,area/core"`
+                - You can add multiple labels in a single command.
+
+            **Guidelines:**
+            - Only use labels that exist in the repository (from the `gh label list` command).
+            - Do not add a comment to the issue.
+            - If no labels seem appropriate, do not apply any.
+
+            **Issue Information:**
+            - Repository: ${{ github.repository }}
+            - Issue Number: ${{ github.event.issue.number }}
+            - Issue Title: ${{ github.event.issue.title }}
+            - Issue Body: ${{ github.event.issue.body }}
+            - Comment (if any): ${{ github.event.comment.body }}