Move cache save to runs.post

src/action.ts

@@ -8,10 +8,11 @@ import {
   copyFileSync,
 } from "node:fs";
 import { addPath, info, warning } from "@actions/core";
-import { isFeatureAvailable, restoreCache, saveCache } from "@actions/cache";
+import { isFeatureAvailable, restoreCache } from "@actions/cache";
 import { downloadTool, extractZip } from "@actions/tool-cache";
 import { getExecOutput } from "@actions/exec";
 import { writeBunfig } from "./bunfig";
+import { saveState } from "@actions/core";
 
 export type Input = {
   customUrl?: string;
@@ -30,6 +31,13 @@ export type Output = {
   cacheHit: boolean;
 };
 
+export type CacheState = {
+  cacheEnabled: boolean;
+  cacheHit: boolean;
+  bunPath: string;
+  url: string;
+};
+
 export default async (options: Input): Promise<Output> => {
   const bunfigPath = join(process.cwd(), "bunfig.toml");
   writeBunfig(bunfigPath, options);
@@ -96,15 +104,17 @@ export default async (options: Input): Promise<Output> => {
     );
   }
 
-  if (cacheEnabled && !cacheHit) {
-    try {
-      await saveCache([bunPath], url);
-    } catch (error) {
-      warning("Failed to save Bun to cache.");
-    }
-  }
-
   const [version] = revision.split("+");
+
+  const cacheState: CacheState = {
+    cacheEnabled,
+    cacheHit,
+    bunPath,
+    url,
+  };
+
+  saveState("cache", JSON.stringify(cacheState));
+
   return {
     version,
     revision,

src/cache-save.ts

@@ -0,0 +1,15 @@
+import { saveCache } from "@actions/cache";
+import { getState, warning } from "@actions/core";
+import { CacheState } from "./action";
+
+(async () => {
+  const state: CacheState = JSON.parse(getState("cache"));
+  if (state.cacheEnabled && !state.cacheHit) {
+    try {
+      await saveCache([state.bunPath], state.url);
+      process.exit(0);
+    } catch (error) {
+      warning("Failed to save Bun to cache.");
+    }
+  }
+})();