- Split the download part into a separate script to so docker keeps that
step in cache and avoid redownloading it.
- With API level >= 28 libiconv is not needed anymore because it's part
of Android's libc.
- Generate standalone toolchains to reduce the docker image size. It's
also easier because it doesn't need to pass sysroot args.
- Use clang compiler because gcc is deprecated in this Android NDK and
will be removed in the next release.
We should be testing latest NDK release but keep using API level 21 to
ensure GLib does not start using newer APIs. We could also later add a
runner for latest API level 28 which includes iconv API in Android's
libc so we don't need GNU libiconv anymore.
We're mostly interested into building and testing everything that gets
pushed to the repository — including merge requests.
When pushing tags, though, we should assume we're spinning a release, so
let's run the dist target, and store the tarball, and the generated
documentation while we're at it, as artifacts on GitLab.
The Dockerfile for the image used for the build is included in tree, and
published on Docker Hub. Using a custom image allows us to avoid the
costly "download and install build dependencies" phase, as well as
controlling the environment a little bit better.
https://bugzilla.gnome.org/show_bug.cgi?id=793635
