strace: execve("/bin/true", ["ldconfig"], 0x563fc29f9fa0 /* 101 vars */) = 0

Resolves #45.

!47 (comment 6125)

This fixes a circular dependency issue noted in [1].

`curl -s` and removal of `--auto-compress` are needed because of
differences in the binaries in alpine.

[1] https://github.com/docker-library/official-images/pull/8999#issuecomment-720622797

add fakechroot dependency in README.md, prevent 'already exists' error when running ln -s by adding -f in Makefile, combine two layers of Dockerfile and fix typo of pugring.gpg~

Signed-off-by: Linux Ninja <linuxninja@bryangay.com>

When building the image for publishing in the infrastructure, we need a
rootfs that's <100MB, due to github filesize restrictions (this, plus
the fact that there's no git-lfs support for building in the docker
library toolchain). Compress the rootfs image so that it can be
hosted on github.

The old Dockerfile and Makefile pair didn't meet the requirements of the
ci-test. Namely, the (very sensible )requirement of not shipping a
private key was missing, the sysusers hook wasn't executed properly and
the /var/cache/pacman/pkg folder was remoed (and it's specified in the
pacman MTREE package)

I commited the wrong Dockerfile.

This commit adds:

- Systemd sysusers hook is ran on the dockerfile
- The dockerfile also populates the archlinux keyring
- Remove the libalpm hooks as they are uneccessary now
- Moved the package cleanup before the tar step on the makefile

The old makefile required commands to be run as a superuser, which
may become problematic when deploying on the archlinux infrastructure.
Use fakeroot and regular pacman commands to allow for to bootstrap a
rootfs.