[NFR] Alpine package

[ruudboon]

Alpine Linux is a security-oriented, lightweight Linux distribution based on musl libc and busybox with the focus on small, simple & secure and often used as docker base image.

I think this strokes with the Phalcon mindset and it would be great if we can publish an Alpine package also.

See also:
https://wiki.alpinelinux.org/wiki/Creating_an_Alpine_package

[sergeyklay]

Close in favor of phalcon/packagecloud#41