Add missing variables to the template

.env.template

@@ -1,4 +1,11 @@
 APP_ENV=
+
+# Can be enabled so that HTTPS is expected locally.
+LOCAL_HTTPS=
+
+# The domain of this RetroMeet. Will be used for emails, user-agents, etc
+LOCAL_DOMAIN=
+
 PGSQL_HOST=
 PGSQL_DATABASE=
 # This is the main database username
@@ -17,12 +24,20 @@ SESSION_SECRET=
 # The first language on the list will be the default in case the user's language is not supported.
 # PHOTON_SUPPORTED_LANGUAGES=en,fr,de
 
-
 # We use nominatim (https://nominatim.org/) as a fallback for geolocation.
 # We use it whenever we cannot use photon, such as when the language is not supported by photon
 # However, nominatim's API limits are low. So this allows us to configure our own nominatim host
 # NOMINATIM_API_HOST=https://nominatim.openstreetmap.org
 
+# Can be used to add information about the current prerelease (i.e alpha1, alpha2, etc)
+RETROMEET_VERSION_PRERELEASE=
+# Can be used to add information about the current version (for instance, fork name)
+RETROMEET_VERSION_METADATA=
+
+# Can be used to override the recommended companion app
+COMPANION_APPLICATION_NAME=
+COMPANION_APPLICATION_URL=
+
 # We recommend that in production you use some S3-like storage: minio, Wasabi, AWS S3, etc
 # You need to configure it using the following variables:
 S3_ENABLED=true
@@ -31,3 +46,21 @@ AWS_ACCESS_KEY_ID=
 AWS_SECRET_ACCESS_KEY=
 S3_ENDPOINT=
 S3_REGION=
+
+# This is to enable SMTP in *dev*. It will be ignored in production (where smtp is always enabled). This can be used to debug emails or see the final result in a client
+USE_SMTP=true
+
+# SMTP variables
+SMTP_PORT=
+SMTP_SERVER=
+SMTP_LOGIN=
+SMTP_PASSWORD=
+SMTP_DOMAIN=
+SMTP_AUTH_METHOD=
+SMTP_CA_FILE=
+SMTP_OPENSSL_VERIFY_MODE=
+SMTP_TLS=
+SMTP_SSL=
+SMTP_ENABLE_STARTTLS=
+SMTP_ENABLE_STARTTLS_AUTO=
+SMTP_FROM_ADDRESS=