add ONE_SHOT so container exits after run

root/check-one-shot.sh

@@ -0,0 +1,9 @@
+#!/command/with-contenv bash
+# shellcheck shell=bash
+
+if [ $ONE_SHOT == "true" ]; then
+
+    # Cleanly kill container by sending kill signal to supervisor process
+    kill 1
+
+fi