build: add docker login

Author: NishaSharma14

.github/workflows/dev-build.yml

@@ -96,6 +96,12 @@ jobs:
         location: ${{ env.GKE_ZONE }}
         credentials: ${{ secrets.GKE_SA_KEY }}
 
+    - name: Log in to Docker Hub
+      uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
+      with:
+        username: ${{ env.DOCKER_HUB_USERNAME  }}
+        password: ${{ env.DOCKER_HUB_PASSWORD  }}
+
     # Build the Docker image
     - name: Build docker image
       run: |-