Added support for GPG

src/util.ts

@@ -0,0 +1,26 @@
+import * as path from 'path';
+
+export function getTempDir() {
+  let tempDirectory = process.env.RUNNER_TEMP;
+  if (tempDirectory === undefined) {
+    let baseLocation;
+    if (isWindows()) {
+      // On windows use the USERPROFILE env variable
+      baseLocation = process.env['USERPROFILE']
+        ? process.env['USERPROFILE']
+        : 'C:\\';
+    } else {
+      if (process.platform === 'darwin') {
+        baseLocation = '/Users';
+      } else {
+        baseLocation = '/home';
+      }
+    }
+    tempDirectory = path.join(baseLocation, 'actions', 'temp');
+  }
+  return tempDirectory;
+}
+
+export function isWindows() {
+  return process.platform === 'win32';
+}