Use BUILD_SIGN_RELEASE env variable to dynamically configure release signing for build environment

Author: jozefizso

.github/workflows/release.yml

@@ -23,6 +23,7 @@ jobs:
       DOTNET_NOLOGO: 1
       DOTNET_CLI_TELEMETRY_OPTOUT: 1
       DOTNET_GENERATE_ASPNET_CERTIFICATE: 0
+      BUILD_SIGN_RELEASE: '${{ vars.BUILD_SIGN_RELEASE }}'
       ContinuousIntegrationBuild: true
       RestoreLockedMode: true
       RepositoryBranch: '${{ github.ref_name }}'