Add Alpine CI job with SourceHut

[XVilka]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the documentation and the rizin book with the relevant information (if needed)

Detailed description

Alpine linux built around Musl and is widely used as a Docker/Podman container base.

Test plan

CI is green

Might be helpful for solving #982

../librz/util/thread.c: In function 'rz_th_setaffinity':
../librz/util/thread.c:138:26: warning: passing argument 1 of 'sched_setaffinity' makes integer from pointer without a cast [-Wint-conversion]
  138 |  if (sched_setaffinity(th->tid, sizeof(c), &c) != 0) {
      |                        ~~^~~~~
      |                          |
      |                          pthread_t {aka struct __pthread *}
In file included from /usr/include/pthread.h:30,
                 from ../librz/include/rz_th.h:24,
                 from ../librz/util/thread.c:4:
/usr/include/sched.h:91:23: note: expected 'pid_t' {aka 'int'} but argument is of type 'pthread_t' {aka 'struct __pthread *'}
   91 | int sched_setaffinity(pid_t, size_t, const cpu_set_t *);
      |                       ^~~~~
[1167/1725] Compiling C object librz/util/librz_util.so.0.4.0-git.p/strpool.c.o
[1168/1725] Compiling C object librz/util/librz_util.so.0.4.0-git.p/strbuf.c.o
[1169/1725] Compiling C object librz/util/librz_util.so.0.4.0-git.p/str_trim.c.o
../librz/util/sys.c: In function 'rz_sys_backtrace':
../librz/util/sys.c:303:2: warning: #warning TODO: rz_sys_bt : unimplemented [-Wcpp]
  303 | #warning TODO: rz_sys_bt : unimplemented
      |  ^~~~~~~

From src/shed/affinity.c from musl:

int sched_setaffinity(pid_t tid, size_t size, const cpu_set_t *set)
{
	return syscall(SYS_sched_setaffinity, tid, size, set);
}

int pthread_setaffinity_np(pthread_t td, size_t size, const cpu_set_t *set)
{
	return syscall(SYS_sched_setaffinity, td->tid, size, set);
}

[ret2libc]

We already build for alpine in our build-static job in ci.yml, why also this?

[XVilka]

@ret2libc consider it's testing PR/branch. I thought it will solve the problem because that one was static and this one is dynamic. Apparently, it didn't resolve the issue.

[ret2libc]

@ret2libc consider it's testing PR/branch. I thought it will solve the problem because that one was static and this one is dynamic. Apparently, it didn't resolve the issue.

I think we already have a lot of checks during a PR creation and I'm of the idea that we don't really need to catch every single system bug at PR time, but it's also ok to have some failures in dev, as long as users are expected to use releases/stable branch.