avoid electron signing for windows

Author: davegarthsimpson

.github/workflows/build.yml

@@ -347,6 +347,7 @@ jobs:
           IS_NIGHTLY: ${{ needs.build-type-determination.outputs.is-nightly }}
           IS_RELEASE: ${{ needs.build-type-determination.outputs.is-release }}
           CAN_SIGN: ${{ secrets[matrix.config.certificate-secret] != '' }}
+          IS_WINDOWS_CONFIG: ${{ matrix.config.name == 'Windows' }}
           # The CREATE_* environment vars are only used to run tests. These secrets are optional. Dependent tests will
           # be skipped if not available.
           CREATE_USERNAME: ${{ secrets.CREATE_USERNAME }}