Make database, oauth, smtp server, mail verificaiton configurable in .env

.env.example

@@ -14,3 +14,39 @@ ADMINS=admin:photos-admin@lists.crans.org
 
 # Email address used as sender for server emails
 SERVER_EMAIL=photos@crans.org
+
+# Email verification: 'mandatory', 'optional', or 'none'
+EMAIL_VERIFICATION=mandatory
+
+# Mail server settings
+SMTP_HOST=localhost
+SMTP_PORT=25
+#SMTP_USER=
+#SMTP_PASSWORD=
+SMTP_USE_TLS=False
+
+# OAuth2 settings
+# Enable OAuth2 login
+OAUTH_ENABLED=False
+# Disable normal username/password login (requires OAUTH_ENABLED=True)
+OAUTH_ONLY=False
+# OAuth2 server base URL (e.g. auth.example.com)
+#OAUTH_SERVER_URL=
+# OAuth2 app credentials
+#OAUTH_CLIENT_ID=
+#OAUTH_CLIENT_SECRET=
+# Button appearance on the login page
+#OAUTH_BUTTON_TEXT=Login with OAuth
+#OAUTH_BUTTON_IMAGE=
+# Space-separated OAuth2 scopes
+#OAUTH_SCOPE=openid profile email
+
+# Database engine: 'sqlite' or 'postgres'
+DB_ENGINE=sqlite
+
+# PostgreSQL settings (only used when DB_ENGINE=postgres)
+#DB_NAME=photo21
+#DB_USER=photo21
+#DB_PASSWORD=
+#DB_HOST=localhost
+#DB_PORT=5432