feat: Add Amazon Linux 2023 support

[grantmcdermott]

Closes #311

Adds AL2023 as a supported distro. The RHEL 9 R builds from Posit are binary-compatible with AL2023, so this maps the platform for version resolution while keeping AL2023 as its own distro for install tooling and repo setup. As discussed in #311 (comment), this uses the P3M "manylinux" binary repo, rather than distro-specific RHEL 9 PPM binaries, to avoid the EPEL dependency problem.

Changes

• src/common.rs: Map linux-amzn-2023 to linux-rhel-9 for the r-hub API version resolution
• src/linux.rs: Add "amzn" branch in select_linux_tools() with simple dnf install, no EPEL
• src/data/repos.json: Enable P3M-manylinux (manylinux_2_28) binaries for "amzn" on both x86_64 and aarch64

Testing

Tested on amazonlinux:2023 (aarch64) in Docker:

docker run -it --rm --privileged -v $(pwd):/work amazonlinux:2023 bash
dnf install -y /work/r-rig-0.8.00.1.2.rpm

After setup:

$ rig system detect-platform
Distribution: amzn
Version:      2023

$ rig resolve release
4.5.3 https://cdn.posit.co/r/rhel-9/pkgs/R-4.5.3-1-1.aarch64.rpm

$ rig add release
[INFO] Running "dnf install -y /tmp/rig/R-4.5.3-1-1.aarch64.rpm"
[INFO] Installing pak for R 4.5.3

Start R

R

P3M manylinux repo is configured automatically, and installing R packages correctly pulls in binaries, e.g.:

> getOption('repos')
P3M  https://packagemanager.posit.co/cran/__linux__/manylinux_2_28/latest

> install.packages('magick')
* installing *binary* package 'magick' ...
* DONE (magick)

> library(magick)
Linking to ImageMagick 6.9.13.25
Enabled features: cairo, fontconfig, freetype, ghostscript, lcms, pango, raw, rsvg, webp, x11

> install.packages('tidyverse')
# all deps install as *binary*

P.S. Some R packages with heavy system library dependencies (e.g. sf) don't have manylinux binaries (only on aarch64?) yet and will fall back to source compilation. But this is a PPM coverage gap, not a rig issue. (E.g., See amazonlinux/amazon-linux-2023#129 (comment))

[grantmcdermott]

Some of the CI runs are failing, but AFAICT these are pre-existing issues (e.g. broken bats install on macOS, fedora-41 aarch64) unrelated to this PR.