Support ed25519 SSH keys for release signing

Author: jiakuan

build.gradle

@@ -27,6 +27,9 @@ scmVersion {
     type = "git"
     // SSH key file is only required when creating a new release and pushing tags to remote repo
     def sshKeyFile = file("${System.properties['user.home']}/.ssh/id_rsa")
+    if (!sshKeyFile.exists()) {
+      sshKeyFile = file("${System.properties['user.home']}/.ssh/id_ed25519")
+    }
     if (sshKeyFile.exists()) {
       customKeyFile = sshKeyFile
       customKeyPassword = ''