fix(install): update install script to support more OS types

[kate-goldenring]

Updates the install script to:

1. detect if the OS is using musl and should use the bin with statically linked deps
2. the $OSTYPE is just "linux" to support OpenSUSE OS (issue described in discord here
3. Removes unnecessary wrapping of spin directory in array which makes the syntax unsupported by sh

[karthik2804]

We may also want to optionally handle the installation of plugins. The plugins installed on linux-musl will probably be broken as we do not distinguish between libc.

[kate-goldenring]

We may also want to optionally handle the installation of plugins. The plugins installed on linux-musl will probably be broken as we do not distinguish between libc.

@karthik2804 to clarify, that means folks using a distro that uses musl cannot write JS spin apps because that requires a plugin right? Should we track this as an issue somewhere -- building plugins with statically linked deps?

[karthik2804]

@kate-goldenring, Yeah - any of the plugins will not work. The JS stuff will be replaced soon once we move over but things like cloud, kube and the trigger-plugins will not. I am not sure building all plugins as statically linked binaries is the best approach here. We may want spin to gain knowledge and fetch appropriate plugins?