ci: add arm targets

[gangliao]

Which issue does this PR close?

Closes #.

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• [ ] I confirm that my contribution is made under the terms of the GNU Affero General Public License v3.0 license.
• [ ] I confirm that I've made a best effort attempt to update all relevant documentation.

[gangliao]

musl was designed from scratch to allow efficient static linking and to have real-time-quality robustness by avoiding race conditions, internal failures on resource exhaustion, and various other bad worst-case behaviors present in existing implementations. The dynamic runtime is a single file with stable ABI allowing race-free updates and the static linking support allows an application to be deployed as a single portable binary without significant size overhead.

cross-compile flock-musl on aarch64 is hard.....