Fix CheckProofOfWork always returning true, fix hashrate display for RandomX, fix Docker root ownership

build.sh

@@ -46,7 +46,7 @@ if [[ "${1:-}" == "--linux-release" ]]; then
     shift
     echo "Building Linux release inside Ubuntu 20.04 Docker container..."
     sudo docker build -t hush-builder -f Dockerfile.build .
-    sudo docker run --rm -v "$SCRIPT_DIR:/hush3" hush-builder "$@"
+    sudo docker run --rm --user "$(id -u):$(id -g)" -v "$SCRIPT_DIR:/hush3" hush-builder "$@"
     echo "Docker build complete. Release is in release-linux/"
     exit $?
 fi