Feature: propagate resolved secrets to interactive container shells

docker/rootfs/etc/profile.d/contenv.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# Source s6 container environment for interactive shells.
+# Ensures variables resolved from *_FILE secret injection are visible
+# when using 'docker exec bash'. Does not affect s6 services (those
+# use with-contenv directly). Has no effect in non-container contexts
+# because the directory will not exist.
+# Note: sh/dash shells opened via 'docker exec sh' are not covered;
+# only bash-based sessions benefit from this file.
+_pngx_contenv="/run/s6/container_environment"
+if [ -d "${_pngx_contenv}" ]; then
+	for _pngx_f in "${_pngx_contenv}"/*; do
+		[ -f "${_pngx_f}" ] || continue
+		_pngx_name=$(basename "${_pngx_f}")
+		_pngx_val=$(cat "${_pngx_f}")
+		export "${_pngx_name}=${_pngx_val}"
+	done
+fi
+unset _pngx_contenv _pngx_f _pngx_name _pngx_val