Add required scripts and move to using a forgejo action instead of Github action

scripts/prepareManifest.mjs

@@ -0,0 +1,45 @@
+/*
+The intent of this script is to do all of the modifications of the
+manifest file that we need to do in order to release the system.
+This can include removing dev-only fields/attributes that end
+users will never, and should never, care about nor need.
+*/
+import { readFile, writeFile } from "fs/promises";
+
+const MANIFEST_PATH = `system.json`;
+
+const {
+	DOWNLOAD_URL,
+	LATEST_URL,
+} = process.env;
+
+let manifest;
+try {
+	manifest = JSON.parse(await readFile(MANIFEST_PATH, `utf-8`));
+	console.log(`Manifest loaded from disk`);
+} catch {
+	console.error(`Failed to parse manifest file.`);
+	process.exit(1);
+};
+
+console.log(`Updating download/manifest URLs`)
+manifest.download = DOWNLOAD_URL;
+manifest.manifest = LATEST_URL;
+
+// Filter out dev-only resources
+if (manifest.esmodules) {
+	console.log(`Removing dev-only esmodules`);
+	manifest.esmodules = manifest.esmodules.filter(
+		filepath => !filepath.startsWith(`dev/`)
+	);
+};
+
+// Remove dev flags
+console.log(`Cleaning up flags`);
+delete manifest.flags?.hotReload;
+if (Object.keys(manifest.flags).length === 0) {
+	delete manifest.flags;
+};
+
+await writeFile(MANIFEST_PATH, JSON.stringify(manifest, undefined, `\t`));
+console.log(`Manifest written back to disk`);