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Update container base image from Ubuntu 16.04 to 20.04

Takuya Noguchi requested to merge container-base-image-ubuntu-20.04 into master

Why is this MR required?

Ubuntu 16.04 LTS would come to be EOL'ed soon (2021-04). Upgrading the base image from the current 16.04 to 20.04 is better until 2021-04.

What does this MR do?

Updates container base image from Ubuntu 16.04 to 20.04. This does NOT change the base version of any edition of AWS' Amazon Machine Images (AMI).

Before

$ docker inspect --format='{{.Id}}' gitlab/gitlab-ee
sha256:39d2b55bd5e15f956fc7ca4b54b6c72dad602fac4aae00df8e00c98a19bb5a4e
$ docker run --rm gitlab/gitlab-ee cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.7 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.7 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

After

TBD

Related issues

Previous update was in !802 (merged) (14.04 to 16.04).

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

  • Merge Request Title, and Description are up to date, accurate, and descriptive
  • MR targeting the appropriate branch
  • MR has a green pipeline on GitLab.com
  • Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
  • trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

  • Test plan indicating conditions for success has been posted and passes
  • Documentation created/updated
  • Tests added
  • Integration tests added to GitLab QA
  • Equivalent MR/issue for the GitLab Chart opened
Edited by Takuya Noguchi

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