add CI for arm64 Linux build for main branch

[q4a]

I was hoping that hiddify-app already support changes, that was made hiddify-core in v3 branch. For example:
rename libcore to hiddify-core or move custom.go and replace setupOnce function

But hiddify-app is not ready for that. That's why I added arm64 Linux support to hiddify-core's main branch, then added fix to hiddify-app and got working VPN on my rk3588 SBC:

user@rock-5b:~$ uname -a
Linux rock-5b 6.14.0-rc4-edge-rockchip64 #1 SMP PREEMPT Sun Feb 23 20:32:57 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux
user@rock-5b:~$ which hiddify 
/usr/bin/hiddify
user@rock-5b:~$ file /usr/bin/hiddify
/usr/bin/hiddify: symbolic link to /usr/share/hiddify/hiddify
user@rock-5b:~$ file /usr/share/hiddify/hiddify
/usr/share/hiddify/hiddify: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=0b28d5e98323e1151526bac46fe7655295ef23c5, for GNU/Linux 3.7.0, not stripped

Here is 1st version of CI with arm64 Linux support in hiddify-core and hiddify-app:
https://github.com/q4a/hiddify-app/actions/runs/14672948667/job/41183552766
I temporarily disabled the rpm and AppImage build:
I will need to add fix for arm64 rpm build:
https://github.com/fastforgedev/fastforge/pull/204/files
And fix/workaround for arm64 AppImage:
fastforgedev/fastforge#188 (comment)
to the repository: https://github.com/hiddify/flutter_distributor