Remove /var/db

We don't need /var/db in leaf containers, and it can grow quite big.

Dockerfile.gitea

@@ -15,5 +15,6 @@ WORKDIR /
 EXPOSE 3000 32799
 VOLUME ["/etc/gitea", "/var/lib/gitea"]
 COPY --from=builder /mnt/gentoo /
+RUN rm -fR /var/db
 USER git:git
 CMD ["/usr/bin/gitea", "web"]