Moved off AWS. (#2)

- Instance in Hetzner.
- Data stored in Backblaze B2.

Reviewed-on: #2
Co-authored-by: M. V. Hutz <git@maximhutz.me>
Co-committed-by: M. V. Hutz <git@maximhutz.me>

gitea/Dockerfile

@@ -4,3 +4,4 @@ ADD --chown=git:git config /etc/gitea
 ADD --chown=git:git custom /etc/gitea-custom
 
 ENV GITEA_CUSTOM=/etc/gitea-custom
+ENV BUCKET_KEY=""