build: add release script to Justfile (#22)

Justfile

@@ -4,6 +4,8 @@ _default:
 alias f := fix
 alias l := lint
 
+version := `tq -f Cargo.toml 'package.version'`
+
 # Install tools needed for development. Make sure cargo-binstall is installed first.
 init:
     cargo binstall cargo-shear taplo-cli typos-cli -y
@@ -25,3 +27,23 @@ fix:
     cargo clippy --no-deps --all-targets --all-features --fix --allow-staged
     just fmt
     git status
+
+# Make a release. `semver_kind` is major/minor/patch
+#
+# requires these tools:
+# - cargo-bump: https://github.com/wraithan/cargo-bump
+# - tomlq:      https://github.com/cryptaliagy/tomlq
+release semver_kind:
+    # bail on uncommitted changes
+    git diff --exit-code --name-only
+    # replace package.version in Cargo.toml
+    cargo bump {{semver_kind}}
+    # update Cargo.lock
+    cargo check
+    @echo Creating release: {{version}}
+    git add Cargo.toml Cargo.lock
+    git commit -m "release: {{version}}"
+    git tag v{{version}}
+    git push --tags
+    cargo publish
+