Extract a github action to reduce the number of references to our MSRV and
stable (to be pinned in the next commit).
While at it, use the MSRV for macOS builds; this means that we'll be less
like accidentally to break the macOS build when bumping the MSRV. I don't
think there is a reason for using 1.73 specifically, other than "it's the
highest we can use on old macOS", so using an even older one should be fine.
These are supposed to be small, so we dump the redundant fish_indent
and fish_key_reader - the fish binary can do those jobs too (both as
builtins and if called via symlinks of that name).
We still keep tarballs instead of just compressing so that we have a
file called "fish" and not "fish-amd64-linux"
We get "undefined reference to `__memmove_chk'" when compiling
pcre2 (via pcre2-sys) on newer Ubuntu.
That one is used with higher fortify_source levels, and Ubuntu 24.04
defaults to 3, while my arch system (where I cannot reproduce)
defaults to 2.
For x86_64 and cross-compiled for aarch64, manually triggered
It *seems* to work, but I had to explicitly disable gettext for it (which is AFAICT currently non-functional under musl anyway).
Also it will create one .zip containing two .tar.xzs. It is about 8MB, which should be fine, tbh.
