added docker check to workflow

.github/workflows/pull-request.yml

@@ -253,6 +253,54 @@ jobs:
       - name: Validate Documents
         run: graphql-inspector validate './src/GraphQl/**/*.ts' './talawa-api/schema.graphql'
 
+  Docker-Start-Check:
+          name: Check if Talawa Admin app starts in Docker
+          runs-on: ubuntu-latest
+          needs: [Code-Quality-Checks]
+          steps:
+             - name: Checkout the Repository
+             uses: actions/checkout@v4
+
+             - name: Set up Docker
+             uses: docker/setup-buildx-action@v3
+
+             - name: Build Docker image
+               run: |
+                 docker build -t talawa-admin-app .
+
+            - name: Run Docker Container
+                run: |
+                  docker run -d --name talawa-admin-app-container -p 8080:8080 talawa-admin-app
+
+            - name: Check if Talawa Admin App is running
+               run: |
+                timeout=60
+               while ! nc -z localhost 8080 && [ $timeout -gt 0 ]; do
+                sleep 1
+                timeout=$((timeout-1))
+              done
+
+              if [ $timeout -eq 0 ]; then
+               echo "Timeout waiting for application to start"
+               exit 1
+               fi
+
+         # Retry curl up to 3 times with 5s delay
+         for i in {1..3}; do
+           if curl --fail --silent http://localhost:8080/index.html; then
+             exit 0
+           fi
+           sleep 5
+         done
+         exit 1
+
+        - name: Stop Docker Container 
+              if: always()
+                run: |
+                 docker stop talawa-admin-app-container
+                 docker rm talawa-admin-app-container
+
+
   Check-Target-Branch:
     if: ${{ github.actor != 'dependabot[bot]' }}
     name: Check Target Branch