fix: speed up build by ensuring stable cache

packages/site-kit/src/lib/markdown/renderer.ts

@@ -1,6 +1,7 @@
 import MagicString from 'magic-string';
 import { createHash, Hash } from 'node:crypto';
 import fs from 'node:fs';
+import process from 'node:process';
 import path from 'node:path';
 import ts from 'typescript';
 import * as marked from 'marked';
@@ -28,9 +29,21 @@ const theme = createCssVariablesTheme({
 	fontStyle: true
 });
 
+// Hash the contents of this file and its dependencies so that we get a new cache in case we have changed
+// how the markdown is rendered (whose logic live here). This is to avoid serving stale code snippets.
 const hash = createHash('sha256');
 hash.update(fs.readFileSync('../../pnpm-lock.yaml', 'utf-8'));
-hash_graph(hash, fileURLToPath(import.meta.url));
+// CAREFUL: update this URL in case you ever move this file or start the dev/build process from another directory
+const original_file = '../../packages/site-kit/src/lib/markdown/renderer.ts';
+if (!fs.existsSync(original_file)) {
+	throw new Error(
+		'Update the path to the markdown renderer code. Current value: ' +
+			original_file +
+			' | Current cwd: ' +
+			process.cwd()
+	);
+}
+hash_graph(hash, original_file);
 const digest = hash.digest().toString('base64').replace(/\//g, '-');
 
 /**