Add a compendium build step in the Github action

scripts/buildCompendia.mjs

@@ -0,0 +1,26 @@
+import { readFile } from "fs/promises";
+import { join } from "path";
+import { compilePack } from "@foundryvtt/foundryvtt-cli";
+
+async function main() {
+	const system = JSON.parse(await readFile(`./system.json`, `utf-8`));
+
+	if (!system.packs || system.packs.length === 0) {
+		console.log(`No compendium packs defined`);
+		process.exit(0);
+	};
+
+	for (const compendium of system.packs) {
+		console.debug(`Packing ${compendium.label} (${compendium.name})`);
+		await compilePack(
+			join(process.cwd(), compendium.path, `_source`),
+			join(process.cwd(), compendium.path),
+			{ recursive: true },
+		);
+		console.debug(`Finished packing ${compendium.name}`);
+	};
+
+	console.log(`Finished packing compendia`)
+};
+
+main();