feat: add scripts for syncing issue labels

We're going to use a github action to trigger this process _normally_,
but I want these scripts to live somewhere.

Author: Stebalien

scripts/sync-labels/.gitignore

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+node_modules/

scripts/sync-labels/README.md

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+# Issue Label Syncer
+
+Manually sync issue labels.
+
+## Install
+
+Before usage, you'll need to install the dependencies.
+
+```go
+$ npm install
+```
+
+## Usage
+
+To sync issue labels to all repos listed in `.config/workflows/config.json`, run:
+
+```bash
+$ node index.js
+```
+
+You can also sync labels to a specific repo:
+
+```bash
+$ node index.js my-org/my-repo
+```

scripts/sync-labels/index.js

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+import githubLabelSync from 'github-label-sync'
+import { readFile } from 'fs/promises'
+import path from 'path'
+import url from 'url'
+
+const GH_TOKEN = process.env.GITHUB_TOKEN
+if (!GH_TOKEN) {
+  console.log('Error: Please set the GITHUB_TOKEN environment variable')
+  process.exit(1)
+}
+
+const REPO_ROOT = path.join(path.dirname(url.fileURLToPath(import.meta.url)), '../../');
+
+(async () => {
+  let repos = process.argv.splice(2)
+  // Apply to all repos if no repos are specified.
+  if (repos.length == 0) {
+    repos = JSON.parse(await readFile(path.join(REPO_ROOT, ".github/workflows/config.json")))
+      .map(item => item.target)
+  }
+
+  let labels = JSON.parse(await readFile(path.join(REPO_ROOT, "templates/.github/issue-labels.json")))
+
+  for (const repo of repos) {
+    try {
+      let diff = await githubLabelSync({
+        accessToken: GH_TOKEN,
+        repo: repo,
+        allowAddedLabels: true,
+        labels: labels
+      })
+      console.log(`updating ${repo}`)
+      for (var change of diff) {
+        switch (change.type) {
+        case 'missing':
+          console.log(`  added ${change.expected.name}`)
+          break;
+        case 'changed':
+          if (change.actual.name !== change.expected.name) {
+            console.log(`  renamed ${change.actual.name} to ${change.expected.name}`)
+          } else if (change.actual.description !== change.expected.description) {
+            console.log(`  changed ${change.actual.name} description to: ${change.expected.description}`)
+          } else if (change.actual.color !== change.expected.color) {
+            console.log(`  recolored ${change.actual.name}`)
+          } else {
+            console.log(`  updated ${change.actual.name}`)
+          }
+          break;
+        case 'added':
+          console.log(`  removed ${change.actual.name}`)
+          break;
+        default:
+          console.log(`  unknown change ${diff}`)
+        }
+      }
+    } catch (e) {
+      console.log(`failed to update labels for ${repo}: ${e}`)
+      console.dir(e, {depth: 4, colors: true})
+    }
+  }
+})()