use ubuntu 20.04 as base instead of CentOS7

[glyg]

Following this discussion: ome/omero-web-docker#67 (it's on the web image, sorry) I ported the DockerFile to ubuntu, which is quite painless thanks to ansible being already aware of ubuntu 20.04

questions:

• how to add sha256 information in the FROM line (not sure where that info is)
• understand why the PATH is changed here and not on the playbooks
• maybe trim the image a bit more?

[snoopycrimecop]

Conflicting PR. Removed from build DOCKER-merge#1976. See the console output for more details.
Possible conflicts:

• PR Enable public user #2 dpwrussell 'Enable public user'
  • Dockerfile
• PR SQL backup/restore (WIP) #19 joshmoore 'SQL backup/restore (WIP)'
  • Dockerfile
• PR Labels #63 jburel 'Labels'
  • Dockerfile
• PR Bump centos from dead07b to c73f515 #68 dependabot[bot] 'Bump centos from dead07b to c73f515'
  • Dockerfile

--conflicts Conflict resolved in build DOCKER-merge#1978. See the console output for more details.

[joshmoore]

Sorry for the @snoopycrimecop noise, @glyg. I'll close some of the older PRs so we can evaluate this. FWIW, @chris-allan mentioned needed to continue supporting rhel/centos 7 (as well as 9) for some time and that that rocky linux images are another possible option.

[imagesc-bot]

This pull request has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/omero-login-ssl-error-dh-key/79574/10

[joshmoore]

@glyg, are you using this in production?

@jburel, might be worth surfacing some of the recent CI decisions here.

[glyg]

@glyg, are you using this in production?

No we deploy our own image (with added plugins) here:

https://gitlab.in2p3.fr/fbi-data/dockers-projects/omero-server

regarding the CI discussion, I think we'll be looking into adapting it to gitlab CI — which might provide some biodiversity, if or when the time comes github "enshityfies" :þ

[glyg]

I am closing this, as the work to change base images is ongoing at the ansible level on #79