Download and build php extension from source codes. The results saved into the folder '/build'.
Usage:
mkdir build
docker run --rm \
-v /`pwd`/build:/build \
-e "GIT_REPO=<url>" \
-e "GIT_VER=<tag|branch>" \
chazer/alpine-php-builder
cp build/*.so /usr/lib/php/modules/
echo "extension=__module__.so" >> /etc/php/conf.d/__module__.ini
docker run -ti chazer/alpine-php-builder <command>