Merge pull request #22 from kexi/release/v1.2.1

chore: prepare v1.2.1 release

Merge pull request #22 from kexi/release/v1.2.1

chore: prepare v1.2.1 release

pitty v1.1.0

First tagged release. Prebuilt binaries for Linux (x86_64, aarch64) and macOS
(arm64); Intel Macs use the cargo-install fallback. Marketplace listing name is
pitty-action (the bare 'pitty' collides with the github.com/pitty user).