Downstream Ruby projects fail `mise install` in CI because mise compiles
Ruby from source via `ruby-build`, and the source build (which also builds
OpenSSL from source) fails on the Ubuntu 24.04 CI image:

    BUILD FAILED (Ubuntu 24.04 on x86_64 using ruby-build 20260616)
    ERROR: Job failed: step "user_script": exec: ... exit code 1

mise's own warning points at the fix: set `ruby.compile=false` to download
a precompiled Ruby binary instead. Precompiled becomes mise's default in
2026.8.0; this opts in early. Faster, and it sidesteps the OpenSSL build
failure entirely.

The setting is gated on the `ruby` flag so non-Ruby projects are unaffected.
No copier migration is required: `.mise.toml` is copier-rendered, so existing
projects pick up the setting on their next `copier update`.

Related work item:
#12

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

chore(deps): update dependency gitlab-org/caproni to v2.63.0

See merge request !781

chore(deps): update dependency gitlab-org/caproni to v2.64.0

See merge request !782

fix(mise): install Ruby from precompiled binaries

See merge request !780