Update desktop build to pull from this repo (#922)

Previously the desktop build lived in a separate repo and had to
download a released version of the maputnik editor source code. Now that
both live in the same repo, the desktop version can simply run the
maputnik build command and use those generated files.

This commit also removes the ci-desktop workflow, which is not needed.
The regular ci workflow already built the desktop version (this commit
also fixes that build).

Fixes #919

If this works for you all, it would be lovely to create a new tag or
release on GitHub for two reasons:
1. So the latest binaries are easier to locate, and
2. So I can update my [submission to
homebrew](https://github.com/Homebrew/homebrew-core/commit/6e536ff007ef0bea5a3591af5678eb3152908cc9)
to make installation easier (for os x users at least)

build/README.md

@@ -0,0 +1,11 @@
+# Build Scripts
+
+This folder holds common build scripts used by some of the Github workflows. 
+
+The scripts are borrowed from [maplibre/maplibre-gl-js](https://github.com/maplibre/maplibre-gl-js/tree/bc70bc559cea5c987fa1b79fd44766cef68bbe28/build).
+
+## Generate Release Notes
+
+`bump-version-changelog.js` Used to update the changelog with the current notes, and set up a space for new notes
+
+`release-notes.js` Used to generate release notes when releasing a new version

build/bump-version-changelog.js

@@ -0,0 +1,29 @@
+#!/usr/bin/env node
+
+/**
+ * This script updates the changelog.md file with the version given in the arguments
+ * It replaces ## main with ## <version>
+ * Removes _...Add new stuff here..._
+ * And adds on top a ## main with add stuff here.
+ *
+ * Copied from maplibre/maplibre-gl-js
+ * https://github.com/maplibre/maplibre-gl-js/blob/bc70bc559cea5c987fa1b79fd44766cef68bbe28/build/release-notes.js
+ */
+
+import * as fs from 'fs';
+
+const changelogPath = 'CHANGELOG.md';
+let changelog = fs.readFileSync(changelogPath, 'utf8');
+changelog = changelog.replace('## main', `## ${process.argv[2]}`);
+changelog = changelog.replaceAll('- _...Add new stuff here..._\n', '');
+changelog = `## main
+
+### ✨ Features and improvements
+- _...Add new stuff here..._
+
+### 🐞 Bug fixes
+- _...Add new stuff here..._
+
+` + changelog;
+
+fs.writeFileSync(changelogPath, changelog, 'utf8');

build/release-notes.js

@@ -0,0 +1,48 @@
+#!/usr/bin/env node
+
+// Copied from maplibre/maplibre-gl-js
+// https://github.com/maplibre/maplibre-gl-js/blob/bc70bc559cea5c987fa1b79fd44766cef68bbe28/build/release-notes.js
+
+import * as fs from 'fs';
+
+const changelogPath = 'CHANGELOG.md';
+const changelog = fs.readFileSync(changelogPath, 'utf8');
+
+/*
+  Parse the raw changelog text and split it into individual releases.
+
+  This regular expression:
+    - Matches lines starting with "## x.x.x".
+    - Groups the version number.
+    - Skips the (optional) release date.
+    - Groups the changelog content.
+    - Ends when another "## x.x.x" is found.
+*/
+const regex = /^## (\d+\.\d+\.\d+.*?)\n(.+?)(?=\n^## \d+\.\d+\.\d+.*?\n)/gms;
+
+let releaseNotes = [];
+let match;
+// eslint-disable-next-line no-cond-assign
+while (match = regex.exec(changelog)) {
+    releaseNotes.push({
+        'version': match[1],
+        'changelog': match[2].trim(),
+    });
+}
+
+const latest = releaseNotes[0];
+const previous = releaseNotes[1];
+
+//  Print the release notes template.
+
+let header = 'Changes since previous version'
+if (previous) {
+  header = `https://github.com/maplibre/maputnik
+  [Changes](https://github.com/maplibre/maputnik/compare/v${previous.version}...v${latest.version}) since [Maputnik v${previous.version}](https://github.com/maplibre/maputnik/releases/tag/v${previous.version})`
+}
+const templatedReleaseNotes = `${header}
+
+${latest.changelog}
+
+// eslint-disable-next-line eol-last
+process.stdout.write(templatedReleaseNotes.trimEnd());