Add restore cache.

post.ts

@@ -0,0 +1,36 @@
+import fs from 'fs';
+import path from 'path';
+import * as cache from '@actions/cache';
+import * as core from '@actions/core';
+import { CARGO_HOME } from './helpers';
+
+async function run() {
+	const enabled = core.getBooleanInput('cache');
+
+	if (!cache.isFeatureAvailable() || !enabled) {
+		return;
+	}
+
+	if (!fs.existsSync(CARGO_HOME)) {
+		core.warning(`~/.cargo does not exist, not saving cache`);
+		return;
+	}
+
+	try {
+		const primaryKey = 'v0-test';
+		const cacheHitKey = core.getState('cacheHitKey');
+
+		if (cacheHitKey === primaryKey) {
+			core.info(`Cache hit occured on the key ${cacheHitKey}, not saving cache`);
+			return;
+		}
+
+		core.info(`Saving cache with key ${primaryKey}`);
+
+		await cache.saveCache([path.join(CARGO_HOME, 'registry')], primaryKey, {}, false);
+	} catch (error: unknown) {
+		core.setFailed((error as Error).message);
+	}
+}
+
+void run();