Remove compiler toolchain and python

[orangejulius]

We currently include a full compiler toolchain (gcc, autoconf, automake, etc), as well as Python, in our Docker baseimage used for all Pelias Docker images.

This used to be required, since we had several Node.js modules that needed to compile native code.

However, since better-sqlite3 added support for prebuilt binaries in version 6.0, I don't think we have any such modules left.

Removing all these packages reduces the uncompressed baseimage size from 243MB to 230MB according to Google's container-diff. That's not huge, but it's not nothing either and if it's free, then why not?

Note that some of our Dockerimages, like whosonfirst and placeholder, include some of these same dependencies, so we'll have to remove them there too.

Closes #21

[orangejulius]

I put together a little script to test that all our Docker images will still work with this change. From a directory with all the pelias repositories checked out, run the following:

#!/bin/bash

set -euo pipefail

for i in api placeholder pip-service whosonfirst geonames csv-importer openaddresses openstreetmap schema docker-libpostal_baseimage; do
        pushd $i
        git stash || true
        git checkout master || true
        git pull
        sed -i 's/FROM pelias\/baseimage/FROM pelias\/baseimage:remove-compiler-toolchain/' Dockerfile
        docker build . -t pelias/$i:remove-compiler-toolchain
        popd
done

All the tested Docker images build fine with this change, so I don't think it will break anything!

Edit: the polylines Docker image had an implicit dependency on gcc to install some Go modules. I'll take a look at sorting that out.

[orangejulius]

I'm going to hit merge on this since it seems safe, but I won't explicitly bump all the end projects to rebuild on this new baseimage just yet. The highly active repositories like API and Placeholder will get this quickly, but I'll take care of all the others after hopefully updating the baseimage to Node.js 16 soon.