feat: switch to boltdb by default to make the container work out of the box

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

Dockerfile

@@ -52,6 +52,8 @@ COPY --from=builder /workspace/templates /srv/sftpgo/web/templates
 COPY --from=builder /workspace/static /srv/sftpgo/web/static
 COPY --from=builder /workspace/sftpgo /usr/local/bin/
 
+RUN sed -i "s/sqlite/bolt/; s|sftpgo.db|/var/lib/sftpgo/sftpgo.db|" /etc/sftpgo/sftpgo.json
+
 RUN chown -R sftpgo:sftpgo /etc/sftpgo /var/lib/sftpgo /srv/sftpgo/web
 
 USER sftpgo