Add linux arm64 binary to release

[tmeijn]

Hi, would be nice if arm64 linux could be added to the GitHub releases so I can install it with either aqua or mise

[hasansezertasan]

Great work everyone 🍾!

This issue seems to be resolved since I can easily do one of them 🤓:

# Using aqua-mise
mise exec aqua:reemus-dev/gitnr -- gitnr --help
# Using ubi-mise
mise exec ubi:reemus-dev/gitnr -- gitnr --help
# Using cargo-mise (mise doc recommends using auqa/ubi)
mise exec cargo:gitnr -- gitnr --help