Use new secrets

Author: jsierles

.github/workflows/docker-build.yml

@@ -31,8 +31,8 @@ jobs:
       - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.FLYIOBUILDS_DOCKERHUB_USERNAME }}
-          password: ${{ secrets.FLYIOBUILDS_DOCKERHUB_TOKEN }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta