chore(jetbrains): publish automatically to stable channel

Co-authored-by: Victor Nogueira <[email protected]>

Author: Andrea Falzetti

components/ide/jetbrains/gateway-plugin/build.gradle.kts

@@ -155,7 +155,7 @@ tasks {
         var pluginChannel: String? = System.getenv("JB_GATEWAY_GITPOD_PLUGIN_CHANNEL")
         if (pluginChannel.isNullOrBlank()) {
             pluginChannel = if (pluginVersion.contains("-main.")) {
-                "Nightly"
+                "Stable"
             } else {
                 "Dev"
             }