Default to sanitizing newlines in secrets

root/etc/s6-overlay/s6-rc.d/init-envfile/run

@@ -7,7 +7,11 @@ if find /run/s6/container_environment/*"FILE__"* -maxdepth 1 > /dev/null 2>&1; t
             SECRETFILE=$(cat "${FILENAME}")
             if [[ -f ${SECRETFILE} ]]; then
                 FILESTRIP=${FILENAME//FILE__/}
+                if [[ ${SECRET_NO_SANITIZE,,} = "true" ]]; then
                     cat "${SECRETFILE}" >"${FILESTRIP}"
+                else
+                    tr -d '\n' < "${SECRETFILE}" >"${FILESTRIP}"
+                fi
                 echo "[env-init] ${FILESTRIP##*/} set from ${FILENAME##*/}"
             else
                 echo "[env-init] cannot find secret in ${FILENAME##*/}"