Feature/ubuntu 20.04 excluding composer and chash from git

[dbendlin]

When excluding

# Get Composer and update Chamilo
WORKDIR /tmp
RUN curl -sS https://getcomposer.org/installer | php
RUN chmod +x composer.phar
RUN mv composer.phar /usr/local/bin/composer

# Get Chash
RUN git clone https://github.com/chamilo/chash.git chash
WORKDIR /tmp/chash
RUN rm -rf vendor
RUN git clone https://github.com/ywarnier/chash-vendors.git vendors
RUN mv vendors/vendor vendor
RUN rm -rf vendors
RUN php -d phar.readonly=0 createPhar.php
RUN chmod +x chash.phar && mv chash.phar /usr/local/bin/chash

Im getting an almost 2GB docker image that works

[ywarnier]

The git clone https://github.com/ywarnier/chash-vendors.git vendors is outdated now, it shouldn't be used anymore, anyway.