Add support for jdk16

Author: headius

9000/jdk16/Dockerfile

@@ -0,0 +1,33 @@
+FROM openjdk:16-jdk-buster
+
+RUN apt-get update && apt-get install -y libc6-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
+ENV JRUBY_VERSION 9.2.17.0
+ENV JRUBY_SHA256 7701d3537b3a606d2765ac6d5c40e675ddaa01d3cebad26a21a66e3aadd5c202
+RUN mkdir /opt/jruby \
+  && curl -fSL https://repo1.maven.org/maven2/org/jruby/jruby-dist/${JRUBY_VERSION}/jruby-dist-${JRUBY_VERSION}-bin.tar.gz -o /tmp/jruby.tar.gz \
+  && echo "$JRUBY_SHA256 /tmp/jruby.tar.gz" | sha256sum -c - \
+  && tar -zx --strip-components=1 -f /tmp/jruby.tar.gz -C /opt/jruby \
+  && rm /tmp/jruby.tar.gz \
+  && update-alternatives --install /usr/local/bin/ruby ruby /opt/jruby/bin/jruby 1
+ENV PATH /opt/jruby/bin:$PATH
+
+# skip installing gem documentation
+RUN mkdir -p /opt/jruby/etc \
+       && { \
+               echo 'install: --no-document'; \
+               echo 'update: --no-document'; \
+       } >> /opt/jruby/etc/gemrc
+
+RUN gem install bundler rake net-telnet xmlrpc
+
+# don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_SILENCE_ROOT_WARNING=1 \
+       BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $GEM_HOME/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
+
+CMD [ "irb" ]
+