changed gemini pr review yaml logic

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

@@ -5,15 +5,20 @@ name: Gemini PR Review
 on:
   pull_request:
     types: [opened, reopened, synchronize]
-  
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
-  review:
+  gemini-pr-review:
     runs-on: ubuntu-latest
+    name: Gemini PR Review
+
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # This fetches the full history
 
@@ -22,7 +27,6 @@ jobs:
         with:
           node-version: '24'
 
-
       - name: Get npm cache directory
         id: npm-cache-dir
         run: |
@@ -36,8 +40,14 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-npm-global-
 
-      - name: Install Gemini CLI globally
-        run: npm install -g --loglevel=http @google/gemini-cli
+      - name: Install Gemini CLI globally (if not already installed)
+        run: |
+          if ! command -v gemini &> /dev/null; then
+            echo "Gemini CLI not found, installing..."
+            npm install -g --loglevel=http @google/gemini-cli
+          else
+            echo "Gemini CLI already installed."
+          fi
 
       - name: Generate git diff and review with Gemini
         id: review
@@ -52,7 +62,6 @@ jobs:
 
           cat /tmp/gemini-client-error*.json || true
 
-
       - name: Post output to PR comment
         id: post_comment
         run: |