[Ubuntu] Old Alpine docker images will be removed and new added on October, 17

[ddobranic]

Breaking changes

We are going to remove alpine:3.12, alpine:3.13 from the list of pre-cached images on VM and add alpine:3.15, alpine:3.16 docker images on Ubuntu 20.04.

We are going to add alpine:3.16 docker image on Ubuntu 22.04.

Target date

Image deployment will start October, 12 and will take 3-4 days. Old versions will be removed starting October 19.

The motivation for the changes

According to our Software and images support policy we support not more than 3 latest LTS versions of images. As we are adding the alpine:3.15 and alpine:3.16 images we have to deprecate alpine:3.12 and alpine:3.13 ones.

Possible impact

If your builds rely on the alpine:3.12 and alpine:3.13 docker images they can be slower due to the necessity of downloading those images.

Platforms affected

• [X] Azure DevOps
• [X] GitHub Actions

Runner images affected

• [ ] Ubuntu 18.04
• [X] Ubuntu 20.04
• [X] Ubuntu 22.04
• [ ] macOS 10.15
• [ ] macOS 11
• [ ] macOS 12
• [ ] Windows Server 2019
• [ ] Windows Server 2022

Mitigation ways

Nothing is required — if there is no local image docker will pull it automatically from the docker hub.