Set default cache input to false for self-hosted runners

src/utils.ts

@@ -1,4 +1,17 @@
+import * as core from '@actions/core';
+
 export enum StableReleaseAlias {
   Stable = 'stable',
   OldStable = 'oldstable'
 }
+
+export const isSelfHosted = (): boolean =>
+  process.env['RUNNER_ENVIRONMENT'] !== 'github-hosted' &&
+  process.env['AGENT_ISSELFHOSTED'] === '1';
+
+export const getCacheInput = (): boolean => {
+  // for self-hosted environment turn off cache by default
+  if (isSelfHosted() && core.getInput('cache') === '') return false;
+
+  return core.getBooleanInput('cache');
+};