Dockerfile.base: Add default DEBVERSION
to avoid the following warning from newer versions of Docker:
- InvalidDefaultArgInFrom: Default value for ARG debian:$DEBVERSION results in empty or invalid base image name (line 2) How to register an account on GitLab. Due to spam, new accounts are locked until approved by an admin or the approver bot. Your GitLab account gets automatically approved within one hour if you are a member of Trusted Contributors in Gerrit, or a member of the Trusted-Contributors group in Phabricator and linked your Developer account to your Phabricator account. If none of these apply, you can file an unlock request to expedite access.
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to avoid the following warning from newer versions of Docker:
- InvalidDefaultArgInFrom: Default value for ARG debian:$DEBVERSION results in empty or invalid base image name (line 2)