[Digital Ocean] Use Debian10 as default image

[srikiz]

Cilium leverages and builds on the kernel BPF functionality as well as various subsystems which integrate with BPF. Therefore, host systems are required to run Linux kernel version 4.9.17 or later to run a Cilium agent.

Using Debian10 should ensure we have the latest kernel that Cilium expects.

[k8s-ci-robot]

Hi @srikiz. Thanks for your PR.

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[hakman]

/ok-to-test

[olemarkus]

Especially since citing cilium as the reason, I would go for Ubuntu. Debian uses nftables by default and cilium doesn't support that. Users need various workarounds for switching to iptables legacy to avoid having both legacy and nftables rules at play.

[hakman]

Thanks @srikiz.
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman, srikiz

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[srikiz]

Thanks @hakman for cherry-picking this into release-1.19 !

[hakman]

😉