inital logic to load env files from a specific identifier FILE__

root/etc/cont-init.d/01-envfile

+#! /bin/bash
+
+if [[ "$(ls /var/run/s6/container_environment/ | xargs)" == *"FILE__"* ]]; then
+  for FILENAME in /var/run/s6/container_environment/*; do
+    if [[ "${FILENAME##*/}" == "FILE__"* ]]; then
+      SECRETFILE=$(cat ${FILENAME})
+      if [[ -f ${SECRETFILE} ]]; then
+        FILESTRIP=${FILENAME//FILE__/}
+        cat ${SECRETFILE} > ${FILESTRIP}
+        echo "[env-init] ${FILESTRIP##*/} set from ${FILENAME##*/}"
+      else
+        echo "[env-init] cannot find secret in ${FILENAME##*/}"
+      fi
+    fi
+  done
+fi