ci: use the repo secrets for dockerhub

Signed-off-by: Abhinandan Purkait <[email protected]>

Author: Abhinandan-Purkait

.github/workflows/build-release.yml

@@ -33,8 +33,8 @@ jobs:
       - name: Login to Docker Hub
         uses: docker/login-action@v3 
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          username: ${{ secrets.OPENEBS_DOCKERUSER }}
+          password: ${{ secrets.OPENEBS_DOCKERPASS }}
 
       - name: Build & Push Image
         run: make all