Keep the Expo action's caches off the GitHub cache service (#219)

The mobile OTA job uploaded the EAS CLI to the GitHub cache service
because expo-github-action caches by default. Turn both of its caches
off and have the Actions budget test reject the Expo action unless they
are off.


Claude-Session: https://claude.ai/code/session_01Wy1md9QE1ayJbDCwJ4vAQs

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -477,6 +477,9 @@ jobs:
           eas-version: latest
           packager: pnpm
           token: ${{ secrets.EXPO_TOKEN }}
+          # Its default caches go to the GitHub cache service; keep them on the runner.
+          eas-cache: false
+          expo-cache: false
       - name: Install dependencies
         if: steps.ota.outputs.publish == 'true' && steps.expo_token.outputs.ready == 'true'
         run: pnpm install --frozen-lockfile

infra/updater/src/github-actions-budget.test.ts

@@ -13,7 +13,18 @@ const workflows = readdirSync(directory)
     return {
       name,
       text,
-      jobs: (parse(text) as { jobs: Record<string, { "runs-on"?: unknown; uses?: string }> }).jobs,
+      jobs: (
+        parse(text) as {
+          jobs: Record<
+            string,
+            {
+              "runs-on"?: unknown;
+              uses?: string;
+              steps?: Array<{ uses?: string; with?: Record<string, unknown> }>;
+            }
+          >;
+        }
+      ).jobs,
     };
   });
 
@@ -34,4 +45,14 @@ describe("GitHub Actions budget", () => {
     expect(text).not.toContain("type=gha");
     expect(text).not.toContain("setup-gradle");
   });
+
+  it.each(workflows)("$name turns off the Expo action's GitHub caches", ({ jobs }) => {
+    for (const job of Object.values(jobs)) {
+      for (const step of job.steps ?? []) {
+        if (!step.uses?.startsWith("expo/expo-github-action")) continue;
+        expect(step.with?.["eas-cache"], step.uses).toBe(false);
+        expect(step.with?.["expo-cache"], step.uses).toBe(false);
+      }
+    }
+  });
 });