Add auto PR generation (#48)

* Remap 1.21.6 to Mojang mappings

* start working on automation

* update newVersion script to use manifest

* update scripts

* update doc

* add dispatchable bump workflow

* update workflow env

* update workflows

.github/commands/bump.js

@@ -0,0 +1,38 @@
+const cp = require('child_process')
+const gh = require('gh-helpers')()
+const bump = require('../../tools/newVersion')
+const exec = (a, o) => {
+  console.log('$', a)
+  cp.execSync(a, { stdio: 'inherit', ...o })
+}
+
+module.exports = async ([newVersion], helpers) => {
+  try {
+    bump(newVersion)
+    // Delete any existing branch named 'bump'
+    exec('git branch -D bump')
+    exec('git checkout -b bump')
+    exec('git add mc/' + newVersion)
+    exec('git commit -m "Add version ' + newVersion + '"')
+    exec('git push origin bump --force')
+    const pr = await gh.createPullRequest(
+      'Add version ' + newVersion,
+      'This automated PR adds version ' + newVersion,
+      'bump',
+      'main'
+    )
+    console.log('Pull request created:', pr.html_url)
+  } catch (error) {
+    console.log('Error bumping version:', error)
+    return helpers.reply('Error bumping version: ' + error.message)
+  }
+}
+
+if (require.main === module) {
+  const args = process.argv.slice(2)
+  if (args.length !== 1) {
+    console.error('Usage: node bump.js <newVersion>')
+    process.exit(1)
+  }
+  module.exports(args, { reply: console.log })
+}