Add missing ca-certificates (for curl/mise install), pkg-config and
libssl-dev (for cargo builds). Remove redundant cargo tool from
mise.toml since it ships with rust.
Add Dockerfile.release using mise to install toolchain, Gitea Actions
workflow with snapshot dry-run on main pushes and full release on tags,
and mise release-docker task for local testing.
Set up GoReleaser with Rust builder (cargo-zigbuild) targeting
linux/darwin x amd64/arm64, Gitea release publishing, and Homebrew
cask generation. Add mise tasks for test, release, and snapshot builds.
