This fixes a regression in 1.1.1/1.1.2 where our PACKAGING docs mention
using `fetch-zig-cache.sh` but it was removed. This commit adds it back,
generating its contents from the build.zig.zon file (via zon2nix which
we use for our Nix packaging).
For packagers, there are no dependency changes: you still need Zig and
POSIX sh. For release time, Ghostty has a new dependency on `jq` but
otherwise the release process is the same. The check-zig-cache.sh script
is updated to generate the new build.zig.zon.txt file.
This adds a new workflow for building and releasing _tagged versions_
of Ghostty. The workflow is triggered automatically by new tags in the
format of `vX.Y.Z` but can also be manually triggered by running the
workflow from the GitHub Actions UI.
Release artifacts are uploaded to a completely separate R2 bucket
with its own access policy, retention, API keys, and so on.
There is currently no way to switch between "channels" in the macOS
app. I will follow up with a separate commit to add this feature.
Fixes#2673
Rather than document this too much, I think it makes sense to just
default this to true when system package mode is enabled (`--system`)
since it seems that in multiple package ecosystems this is the desired
behavior.
This can still be overridden by setting `-Dpie=false`.
