Add container IDs to debug log

abra

@@ -1142,6 +1142,8 @@ sub_app_run(){
     exit
   fi
 
+  debug "Using Container ID ${CONTAINER}"
+
   # 3wc: we want the "splitting" that shellcheck warns us about, so that -u and
   # $RUN_USER aren't treated as a single argument:
   # shellcheck disable=SC2086
@@ -1245,6 +1247,8 @@ sub_app_cp() {
     exit
   fi
 
+  debug "Using Container ID ${CONTAINER}"
+
   # Replace $SERVICE with $CONTAINER in the original args
   CP_ARGS=$(echo "$SOURCE $DEST" | sed "s/$SERVICE:/$CONTAINER:/")
   # FIXME 3wc: this might cause problems for filenames with spaces..