Use environment variables in Django settings

.env.example

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+# One of "development", "staging", "production". Defaults to "development".
+# In any environment that is not "production", a big visible warning naming
+# the current environment is shown at the top of every page.
+# When the environment is "development", DEBUG is set to True.
+SERVALA_ENVIRONMENT='development'
+
+# Set PREVIOUS_SECRET_KEY when rotating to a new secret key in order to not expire all sessions
+# SERVALA_PREVIOUS_SECRET_KEY=''
+SERVALA_SECRET_KEY='django-insecure-8sl^1&1f-$3%w7cf)q(rcvi4jo(#s3ug-@be0ooc2ioep*&%7@'
+
+# Set the allowed hosts as comma-separated list.
+# Use a leading dot to match a domain and all subdomains.
+# Leave or unset in the development environment in order to accept localhost names.
+SERVALA_ALLOWED_HOSTS='.example.com'
+
+# Database settings:
+# In development mode, leave the DB name empty in order to use a SQLite database called db.sqlite3
+# Otherwise, defaults point to a local PostgreSQL database with name and user "servala".
+# You MUST set the password.
+SERVALA_DB_USER=''
+SERVALA_DB_PASSWORD=''
+SERVALA_DB_HOST=''
+SERVALA_DB_PORT=''
+
+# Location for file uploads. Leading "/" for absolute path, otherwise relative to base dir
+# Defaults to 'media'
+SERVALA_MEDIA_ROOT=''
+
+SERVALA_EMAIL_HOST='localhost'
+SERVALA_EMAIL_PORT='25'
+SERVALA_EMAIL_USER=''
+SERVALA_EMAIL_PASSWORD=''
+# At most one of the following settings may be set to True
+SERVALA_EMAIL_TLS='False'
+SERVALA_EMAIL_SSL='False'