🔧(backend) tool for valid fernet key used in OIDC token storage

Add bin/fernetkey that generates a key for the OIDC_STORE_REFRESH_TOKEN_KEY
setting.

Signed-off-by: Fabre Florian <ffabre@hybird.org>

bin/fernetkey

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+# shellcheck source=bin/_config.sh
+source "$(dirname "${BASH_SOURCE[0]}")/_config.sh"
+
+_dc_run app-dev python -c 'from cryptography.fernet import Fernet;import sys; sys.stdout.write("\n" + Fernet.generate_key().decode() + "\n");'