install cargo nextest in Docker

Author: marxin

.github/cross-linux-riscv64/Dockerfile

@@ -63,6 +63,9 @@ ENV CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc
 
 RUN rustup target add riscv64gc-unknown-linux-gnu --toolchain 1.87-x86_64-unknown-linux-gnu
 
+# quickly install cargo nextest by using pre-built binary
+RUN curl -LsSf https://get.nexte.st/latest/linux | tar zxf - -C ${CARGO_HOME:-~/.cargo}/bin
+
 #compile libssl-dev for riscv64!
 COPY build_openssl.sh /
 RUN /build_openssl.sh