Disable the initial key refresh

It takes 10 seconds and in the common case doesn't change anything. It would
only be relevant in case an existing key in the keyring expires which can easily
be prevented if we always use the newest installer (which is a good idea anyway,
to keep the amount of initial updates low)

Fixes #45

main.js

@@ -56,6 +56,10 @@ async function run() {
 
       changeGroup('Extracting MSYS2...');
       await exec.exec(inst_dest, ['-y'], {cwd: dest});
+
+      changeGroup('Disable Key Refresh...');
+      let post_file = `${dest}\\msys64\\etc\\post-install\\07-pacman-key.post`;
+      await exec.exec(`powershell.exe`, [`((Get-Content -path ${post_file} -Raw) -replace '--refresh-keys', '--version') | Set-Content -Path ${post_file}`]);
       core.endGroup();
     }