Trying out rust-musl-builder for cargo publish (#1856)

Trying out rust-musl-builder for cargo publish (#1856)

* Trying out rust-musl-builder for cargo publish

* Version 0.13.5-rc.1

* Try rust:nightly

* Version 0.13.5-rc.2

* Try rust slim

* Version 0.13.5-rc.3

* Try rust 1.51

* Version 0.13.5-rc.4

* Trying another nightly

* Version 0.13.5-rc.5

* Trying another fix

* Version 0.13.5-rc.6