Add secrets and configs versionning

.env.sample

@@ -11,6 +11,13 @@ PEERTUBE_ADMIN_EMAIL=admin@example.com   # <= EDIT THIS
 PEERTUBE_SIGNUP_ENABLED=false
 PEERTUBE_TRANSCODING_ENABLED=true
 
+SECRET_DB_PASSWORD_VERSION=v1
+APP_ENTRYPOINT_VERSION=v1
+
+## Increment when nginx config or webseed setings change
+NGINX_CONFIG_VERSION=v1
+
+
 ## Webseed backend
 #
 #  If no NGINX_WEBSEED option is enabled, videos will be served