Enable GitHub global install via prepare script

Author: pweiskircher

README.md

@@ -15,13 +15,24 @@ Output format is documented in [API.md](./API.md).
 
 ## Install
 
+Global install from GitHub (short-term distribution):
+
+```bash
+npm install -g github:PSPDFKit-labs/buildkite-cli#main
+bkci --help
+```
+
+For reproducible installs, pin a tag or commit instead of `#main`.
+
+Local development:
+
 ```bash
 pnpm install
 pnpm run build
 pnpm run test
 ```
 
-Run:
+Run from source:
 
 ```bash
 node dist/index.js <command>

package.json

@@ -9,6 +9,7 @@
   },
   "scripts": {
     "build": "tsc -p tsconfig.json",
+    "prepare": "pnpm run build",
     "dev": "tsx src/index.ts",
     "check": "tsc --noEmit -p tsconfig.json",
     "test": "pnpm run build && node --test dist/**/*.test.js"