root: fix certs file missing in container

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

Dockerfile

@@ -64,8 +64,8 @@ RUN apt-get update && \
     apt-get clean && \
     rm -rf /tmp/* /var/lib/apt/lists/* /var/tmp/ && \
     adduser --system --no-create-home --uid 1000 --group --home /authentik authentik && \
-    mkdir /backups && \
-    chown authentik:authentik /backups
+    mkdir -p /backups /certs /media && \
+    chown authentik:authentik /backups /certs /media
 
 COPY ./authentik/ /authentik
 COPY ./pyproject.toml /