added docker check to workflow

.github/workflows/pull-request.yml

@@ -253,6 +253,45 @@ 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, Test-Application]
+    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
+          curl --fail --silent http://localhost:8080/index.html || 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
@@ -262,4 +301,4 @@ jobs:
         if: github.event.pull_request.base.ref != 'develop'
         run: |
           echo "Error: Pull request target branch must be 'develop'. Please refer PR_GUIDELINES.md"
-          exit 1
+          exit 1