fix: dev: [compose-core] better capture error in ``get_service_relation``

bin/compose-core

@@ -2458,16 +2458,19 @@ get_service_relation() {
         return 0
     fi
 
-    while read-0 rn ts rc td; do
+    while read-0-err E rn ts rc td; do
         [ "$relation" == "$rn" ] && {
             printf "%s\0" "$ts" "$rc" "$td"
             break
         }
-    done < <(get_service_relations "$service") > "$cache_file"
+    done < <(p-err get_service_relations "$service") > "${cache_file}.wip"
     if [ "$?" != 0 ]; then
-        rm -f "$cache_file"  ## no cache
         return 1
     fi
+    if [ "$E" != 0 ]; then
+        return 1
+    fi
+    mv "${cache_file}"{.wip,} || return 1
     cat "$cache_file"
 }
 export -f get_service_relation