Fix variable substitution in users_database.yml

- Update localize_users_database_file to properly resolve nested variables in AUTHELIA_ADMIN_EMAIL
- Fix template to use correct AUTHELIA_* variables instead of DEFAULT_* variables
- Update deploy-core.sh to only process files containing variables and fix .env path
- Fix file permissions for authelia config files

docker-compose/core/authelia/config/users_database.yml.template

@@ -3,10 +3,10 @@
 ###############################################################
 
 users:
-  ${DEFAULT_USER}:
-    displayname: "Administrator"
-    password: "${DEFAULT_PASSWORD_HASH}"  # Generate with: docker run authelia/authelia:latest authelia crypto hash generate pbkdf2 --password 'yourpassword'
-    email: ${DEFAULT_EMAIL}
+  ${AUTHELIA_ADMIN_USER}:
+    displayname: "${AUTHELIA_ADMIN_USER}"
+    password: "${AUTHELIA_ADMIN_PASSWORD_HASH}"
+    email: ${AUTHELIA_ADMIN_EMAIL}
     groups:
       - admins
       - users