fix: processes in docker images and pass full environment to

subprocesses

Since 1.0.4 release devtools require systemd to be run in order to
create slice for unit

docker/systemd-nspawn.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Since https://gitlab.archlinux.org/archlinux/devtools/-/commit/5f4fd52e3836ddddb25a0f9e15d0acfed06f693d
+# it is impossible to start devtools inside docker container, because it requires slice registering
+# which is impossible because there is no init in container
+
+is_slice() {
+    [[ $1 =~ ^--slice* ]]
+}
+
+allowed=()
+for arg in "$@"; do
+    is_slice "$arg" && allowed+=("--keep-unit") || allowed+=("$arg")
+done
+
+exec /usr/bin/systemd-nspawn "${allowed[@]}"