updated and added environment variable setup

Signed-off-by: Gergely Brautigam <182850+Skarlso@users.noreply.github.com>

Author: Skarlso

intellij-plugin/build.gradle.kts

@@ -43,6 +43,22 @@ intellijPlatform {
             untilBuild = "251.*"
         }
     }
+    
+    pluginVerification {
+        ides {
+            recommended()
+        }
+    }
+    
+    signing {
+        certificateChain = providers.environmentVariable("CERTIFICATE_CHAIN")
+        privateKey = providers.environmentVariable("PRIVATE_KEY")
+        password = providers.environmentVariable("PRIVATE_KEY_PASSWORD")
+    }
+    
+    publishing {
+        token = providers.environmentVariable("PUBLISH_TOKEN")
+    }
 }
 
 tasks {