added gemini workflow

.github/workflows/gemini-pr-review.yaml

@@ -0,0 +1,65 @@
+# Filename: .github/workflows/gemini-pr-review.yaml
+
+name: Gemini PR Review
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+  
+  workflow_dispatch:
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0 # This fetches the full history
+
+      - name: Setup Node.js 24
+        uses: actions/setup-node@v6
+        with:
+          node-version: '24'
+
+
+      - name: Get npm cache directory
+        id: npm-cache-dir
+        run: |
+          echo "dir=$(npm config get cache)" >> $GITHUB_OUTPUT
+
+      - name: Cache global npm packages
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.npm-cache-dir.outputs.dir }}
+          key: ${{ runner.os }}-npm-global-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-npm-global-
+
+      - name: Install Gemini CLI globally
+        run: npm install -g --loglevel=http @google/gemini-cli
+
+      - name: Generate git diff and review with Gemini
+        id: review
+        env:
+          GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}
+        run: |
+          echo "Generating diff..."
+          git diff "${{ gitea.event.pull_request.base.sha }}...${{ gitea.event.pull_request.head.sha }}" > pr.diff
+
+          echo "Performing code review with Gemini..."
+          cat .github/workflows/gemini-pr-review.md pr.diff |  gemini > /tmp/gemini-output.txt
+
+          cat /tmp/gemini-client-error*.json || true
+
+
+      - name: Post output to PR comment
+        id: post_comment
+        run: |
+          JSON_PAYLOAD=$(python3 -c 'import json, sys; print(json.dumps({"body": sys.stdin.read()}))' < /tmp/gemini-output.txt)
+          curl --request POST --silent --show-error \
+          --url "${{ gitea.server_url }}/api/v1/repos/${{ gitea.repository }}/issues/${{ gitea.event.pull_request.number }}/comments" \
+          --header "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+          --header "Content-Type: application/json" \
+          --header "accept: application/json" \
+          --data "${JSON_PAYLOAD}"