feat: WIP s6-overlay and friends

packages/configs/s6-overlay/nestri-server/notification-fd

@@ -0,0 +1 @@
+3

packages/configs/s6-overlay/nestri-server/run

@@ -0,0 +1,25 @@
+#!/command/with-contenv bash
+set -euo pipefail
+
+if [[ -f /etc/nestri/common.sh ]]; then
+    source /etc/nestri/common.sh
+else
+    exit 1
+fi
+
+# remove possibly stale socket
+rm -f "${NESTRI_XDG_RUNTIME_DIR}/wayland-1"
+
+s6-setuidgid ${NESTRI_USER} nestri-server $NESTRI_PARAMS &
+PROCESS_PID=$!
+
+# wait for socket
+while ! test -S "${NESTRI_XDG_RUNTIME_DIR}/wayland-1"; do
+  sleep 1
+done
+
+# notify
+printf 'ready\n' >&3
+
+# wait till process exists
+wait "${PROCESS_PID}"

packages/configs/s6-overlay/nestri-server/type

@@ -0,0 +1 @@
+longrun