Increase postback timeout to 60s

services/git-bridge/src/main/java/uk/ac/ic/wlgitbridge/snapshot/push/PostbackPromise.java

@@ -35,7 +35,7 @@ public class PostbackPromise {
         try {
             while (!received) {
                 try {
-                    if (!cond.await(30, TimeUnit.SECONDS)) {
+                    if (!cond.await(60, TimeUnit.SECONDS)) {
                         throw new PostbackTimeoutException();
                     }
                 } catch (InterruptedException e) {

services/git-bridge/src/main/java/uk/ac/ic/wlgitbridge/snapshot/push/exception/PostbackTimeoutException.java

@@ -13,7 +13,7 @@ public class PostbackTimeoutException extends SevereSnapshotPostException {
 
     @Override
     public String getMessage() {
-        return "timeout";
+        return "timeout (60s)";
     }
 
     @Override