Publish pre-built binary for linux/s390x

[agungsb]

💻 Example
I would like to be able to run the install script on arm64 linux machines.

$ curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh 

Currently it fails with

wasm-pack-init: no precompiled binaries available for CPU architecture: s390x

💡 Description

• The release workflow should build and publish a binary for s390x-unknown-linux-gnu.
• The install script should look up and install pre-built binary for s390x.