add mkarchrepo.sh
add mkarchrepo.sh

use for GitHub hosted perl6 repo at:
https://github.com/atweiden/pkgbuilds/releases/download/latest

- upload contents of `~/perl6` to GitHub release tagname `latest`
  - moarvm-YYYY.MM-1-x86_64.pkg.tar.xz
  - nqp-YYYY.MM-1-x86_64.pkg.tar.xz
  - perl6.db
  - perl6.db.tar.gz
  - perl6.files
  - perl6.files.tar.gz
  - rakudo-YYYY.MM-1-x86_64.pkg.tar.xz

to use:

```sh
cat >> /etc/pacman.conf <<'EOF'
[perl6]
SigLevel = Optional TrustAll
Server = https://github.com/atweiden/pkgbuilds/releases/download/latest
EOF
```

Credit: https://fusion809.github.io/how-to-create-archlinux-repository/

atweiden/pkgbuilds