ci(dockerhub): fix docker hub autobuild

Author: thomasleplus

pdf/docker-compose.test.yml

@@ -7,7 +7,8 @@ services:
     command: |
       sh -c '
         set -euo pipefail
-        if [ $(id -u) -ne 1000 ]; then
+        # Use $$ to prevent interpolation 
+        if [ $$(id -u) -ne 1000 ]; then
           exit 1
         fi
         base64 --version # coreutils