Build ohcount for Ubuntu 22.04 (#87)

OTWO-6971

Dockerfile

@@ -1,17 +1,23 @@
-FROM ubuntu:18.04
+FROM ubuntu:22.04
 
 ENV APP_HOME /var/local/ohcount
+ENV RBENV_PATH /usr/local/rbenv
 
 RUN apt-get update \
-  && apt-get install -y ruby ruby-dev git libpcre3 libpcre3-dev libmagic-dev gperf gcc ragel swig \
-  && cp /usr/include/x86_64-linux-gnu/ruby-2.5.0/ruby/config.h /usr/include/ruby-2.5.0/ruby/
+  && apt-get install -y git libpcre3 libpcre3-dev libmagic-dev gperf gcc ragel swig software-properties-common
 
-# RUN mkdir -p /var/local/repos
-# RUN apt-get install -y vim-tiny ranger
+RUN apt-get install -y curl make zlib1g-dev bzip2 libreadline-dev # ruby build dependencies.
+RUN git clone https://github.com/rbenv/rbenv.git $RBENV_PATH \
+  && git clone https://github.com/sstephenson/ruby-build.git $RBENV_PATH/plugins/ruby-build \
+  && echo 'export PATH="/usr/local/rbenv/shims:/usr/local/rbenv/bin:/usr/local/rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc \
+  && echo 'eval "$(rbenv init -)"' >> ~/.bashrc \
+  && . ~/.bashrc \
+  && rbenv install 2.6.9 && rbenv global 2.6.9 \
+  && rbenv rehash
 
 RUN mkdir -p $APP_HOME
 COPY . $APP_HOME
 
-RUN cd $APP_HOME && ./build
+RUN cd $APP_HOME && . ~/.bashrc && ./build
 
 WORKDIR $APP_HOME