manipulate goreleaser and appveyor for release from appveyor

[mrpalide]

Did you run make format && make check? Yes

Fixes # -

Changes:

• Separate linux and darwin/windows build.
• Fix AppVeyor to do releases more straightforward, with just push new tags

How to test this PR:

• For test linux release, test on linux machine by make dep-github-release && make snapshot linux command.
• For darwin/windows build, just run make snapshot command on mca os machine.
• Actually for push new release, after merge this PR, we just need set new tag and push it to repo. Both develop and master branches are OK to get tag.
• Also I test on my fork, this is release, and this is AppVeyor logs.

[jdknives]

Summarising the discussion on Matrix:

• as it looks like we can do static builds with musl for the systray versions, we can get rid of the dynamic build config and just use the static goreleaser config as the default and only one available for releases
• please use the cross compilers available here https://musl.cc/#binaries or elsewhere to compile all binaries with musl