chore: switch to workflow for contributors badge

scripts/all-contributors-badge.ts

@@ -0,0 +1,20 @@
+import * as fs from 'fs'
+import { resolve } from 'path'
+
+function path(...segments: string[]) {
+  return resolve(__dirname, '..', ...segments)
+}
+
+const README = fs.readFileSync(path('README.md'), { encoding: 'utf8' }),
+  { contributors } = JSON.parse(fs.readFileSync(path('.all-contributorsrc'), { encoding: 'utf8' }))
+if (!(contributors instanceof Array)) throw new Error('Invalid config file')
+
+const updatedREADME = README
+  .split('\n')
+  .map(line =>
+    line.startsWith('[![All Contributors](https://img.shields.io/badge/all_contributors-')
+      ? `[![All Contributors](https://img.shields.io/badge/all_contributors-${contributors.length}-orange.svg?style=flat)](#contributors-)`
+      : line
+  ).join('\n')
+
+fs.writeFileSync(path('README.md'), updatedREADME)