fix: return true when removing temporary files extracted from docker

If you are running docker in docker, the permissions on the generated file are such that they may not be accessible by the normal dokku user. For dokku, it is good enough to ignore the failed removal.

plugins/common/functions

@@ -391,7 +391,7 @@ copy_from_image() {
     fi
 
     TMP_FILE_COMMAND_OUTPUT=$(mktemp "/tmp/dokku-${FUNCNAME[0]}.XXXX")
-    trap "rm -rf '$TMP_FILE_COMMAND_OUTPUT' >/dev/null" RETURN
+    trap "rm -rf '$TMP_FILE_COMMAND_OUTPUT' >/dev/null || true" RETURN
 
     local CID=$("$DOCKER_BIN" create "${DOCKER_CREATE_LABEL_ARGS[@]}" $DOKKU_GLOBAL_RUN_ARGS "$IMAGE")
     "$DOCKER_BIN" cp "$CID:$SRC_FILE" "$TMP_FILE_COMMAND_OUTPUT" 2>/dev/null || true