Add ubuntu 20.04 image for linux-riscv64

Author: luhenry

README.md

@@ -72,6 +72,19 @@ $ cd ubuntu18_s390x
 $ docker build --rm --force-rm --squash -t evolvedbinary/rocksjava:ubuntu18_s390x-be .
 ```
 
+# Ubuntu 20.04 Docker Images
+To build the Ubuntu 20.04 Docker images locally:
+```bash
+$ git clone https://github.com/evolvedbinary/docker-rocksjava
+$ cd docker-rocksjava
+```
+
+## Requires riscv64 arch CPU
+```
+$ cd ubuntu20_riscv64
+$ docker build --rm --force-rm --squash -t evolvedbinary/rocksjava:ubuntu20_riscv64-be .
+```
+
 # Alpine 3.10 Docker Images
 **NOTE**: Alpine uses *muslc* instead of *glibc*, and so RocksDB builds on Alpine will only run on systems with muslc.
 

ubuntu20_riscv64/Dockerfile

@@ -0,0 +1,17 @@
+FROM riscv64/ubuntu:20.04
+
+MAINTAINER Evolved Binary Ltd <tech@evolvedbinary.com>
+
+LABEL name="Ubuntu 20.04 (riscv64) RocksJava Build Environment" \
+  vendor="Evolved Binary Ltd"
+
+RUN apt-get -y update \
+  && apt-get -y dist-upgrade \
+  && apt-get -y install cmake \
+  && apt-get -y install g++ make perl \
+  && apt-get -y install libjemalloc-dev zlib1g-dev libbz2-dev liblz4-dev libsnappy-dev libzstd-dev libgflags-dev \
+  && apt-get -y install openssl openjdk-11-jdk-headless wget curl
+
+ENV JAVA_HOME=/usr/lib/jvm/java-11-openjdk-riscv64
+ENV PATH=$JAVA_HOME:$PATH
+ENV LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib