Fix condition relaying on bash

Since there is no need to rely on bash try to make the script more
compatible.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

rebase-scripts/fork-in-pkg-rebase-trixie

@@ -68,7 +68,7 @@ then
     # Check fork status to ensure the forking id completed.
     # Forking is an asynchronous process...
     FORKING_DONE=0
-    while [ $FORKING_DONE == 0 ]
+    while [ $FORKING_DONE = 0 ]
     do
         sleep 2
         curl_get ${GITLAB_API}/projects/${PRJ_ID}/import > import.log