src: check against platform specific versions for latest and unstable

Check against platform and package specific version numbers returned
from pkgs.tailscale.com instead of defaulting to "Version" as this can
be incorrect for certain platforms when a release has only been built
for a subset of platforms.

For example. 1.90.2 is available for linux at the time of writing so
"Version" is 1.90.2, but only 1.90.1 is available for windows which
causes an error when using latest as the version specifier on windows
machines.

Fixes #219

Signed-off-by: Mario Minardi <mario@tailscale.com>

Author: mpminardi

dist/index.js

@@ -262,7 +262,17 @@ async function resolveVersion(
       pkg,
     ]);
     const response = JSON.parse(stdout);
-    return response.Version;
+    switch (runnerOS) {
+      case runnerLinux:
+        return response.TarballsVersion;
+      case runnerMacOS:
+        // Use latest tag on macOS since we are building from source
+        return response.Version;
+      case runnerWindows:
+        return response.MSIsVersion;
+      default:
+        return response.Version;
+    }
   }
 
   return version;