Install new ruby version for M1 macs

add-ruby.sh

#/bin/bash
# Place in ~/bin

echo "Enter the ruby you want to install. E.g. 2.7.6"
read ruby_version

if [ -x "$(command -v rvm)" ]; then
    if ! rvm install $ruby_version --with-gcc=clang; then
        cd $HOME/.rvm/src/ruby-$ruby_version
        make install
        rvm use $ruby_version --create
    fi
elif [ -x "$(command -v rbenv)" ]; then
    export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)"
    export RUBY_MAKE_OPTS="-j 1"
    rbenv install $ruby_version
    rbenv shell $ruby_version
else
    echo "You need to install rvm or rbenv"
fi