(r) Remove redundant signing determination code from build system

Author: per1234

.github/workflows/build.yml

@@ -289,7 +289,6 @@ jobs:
       SIGNTOOL_PATH: "C:/Program Files (x86)/Windows Kits/10/bin/10.0.19041.0/x86/signtool.exe"
       WIN_CERT_PASSWORD: ${{ secrets[matrix.config.certificate-password-secret] }}
       WIN_CERT_CONTAINER_NAME: ${{ secrets[matrix.config.certificate-container] }}
-      WIN_SIGNING_ENABLED: ${{ secrets[matrix.config.certificate-password-secret] != '' }}
 
     strategy:
       matrix:

electron-app/scripts/windowsCustomSign.js

@@ -1,10 +1,7 @@
 const childProcess = require('child_process');
 
 exports.default = async function (configuration) {
-  if (
-    !process.env.GITHUB_ACTIONS ||
-    process.env.WIN_SIGNING_ENABLED !== 'true'
-  ) {
+  if (!process.env.GITHUB_ACTIONS || process.env.CAN_SIGN !== 'true') {
     return;
   }