Build linux_x86_64 in manylinux2014 container

[fapdash]

• use manylinux2014 for improved compatibility, also see https://github.com/pypa/manylinux
• use node16 for CentOS7 compatibility (see Composite Actions using Node 20 don't work with CentOS 7 actions/runner#2906)
• install rustup in an extra step so we don't hit Support manylinux2014 / CentOS 7 dtolnay/rust-toolchain#122

[justinbarclay]

Hey @fapdash, sorry for taking so long to get back to you.

I don't want the default version of the library to be based on the manylinux variant, the trade off looks to be using outdated tech and I don't want to have to maintain that. However, I am happy to have a manylinux variant of parinfer-rust-emacs be an option to download automatically from parinfer-rust-mode.

I would like to see the manylinux version in its own workflow file and upload it with a separate name from parinfer-rust-linux.so . Maybe something like parinfer-rust-snapd-linux.so , since this is the variant we are specifically looking to address. But I trust you to pick out an appropriate name to help you find the correct version of the library when reading through docs.

After that, I would have to make parinfer-rust--lib-name customizable and then users should be able to set their config to parinfer-rust-<name>.so be able to auto-download their preferred variant.