This patch implements 6 additional environment variables that are used
for configuration of the database in order to allow easier configuration
in containerised environments, such as Kubernetes.
An example is the upcoming deployment of the demo instance that will use
an operator-backed postgresql database. This operator exposes username
and password as separate variables and while it's obviously possible to
generate a dbURL from that, this won't be possible without additional
code. Aiming for a solution in Hedgedoc itself, will help us to enable
other people in using Hedgedoc on Kubernetes without resulting in overly
customised setups for simple tasks like this.
Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>
This mitigates unintended note creation by bots or humans through a
simple GET call.
See discussion in #754.
Signed-off-by: Nicolas Dietrich <nidi@mailbox.org>
