docs(docker): hint on BuildKit being required

[megglos]

Description

As found yesterday the recent changes to the Dockerfile introducing the TARGETARCH var require Docker BuildKit to be enabled.

[Zelldon]

Could you please announce this in the team channel as well? Since we all need to build the images for benchmarks or is there maybe a better way to do that? Like per default we build images which don't need it and in our release pipeline we only need to set it ? 🤔

[github-actions]

Test Results

   958 files  ±    0     958 suites  ±0   1h 42m 39s ⏱️ -32s
7 855 tests +325  7 848 ✔️ +325  7 💤 ±0  0 ❌ ±0 
8 055 runs  +325  8 046 ✔️ +325  9 💤 ±0  0 ❌ ±0 

Results for commit 4f32709. ± Comparison against base commit 0ab1c7d.

♻️ This comment has been updated with latest results.

[lenaschoenburg]

Thanks 👍

[megglos]

Could you please announce this in the team channel as well? Since we all need to build the images for benchmarks or is there maybe a better way to do that?

Will do, thanks for the reminder!

Like per default we build images which don't need it and in our release pipeline we only need to set it ? 🤔

With the current state of the Dockerfile a local docker build might fail if BuildKit is not enabled as it can't resolve the used variable which is only provided if BuildKit is enabled.
As going forward Docker intents to replace the legacy builder with BuildKit, I think it's generally fine (and actually recommended) to enable it by default also on Linux, see BuildKit provides many enhancements over the classic builder [..] is overall recommended to be used if supported on the user's platform. moby/moby#40379 .

[megglos]

bors r+

[zeebe-bors-camunda]

Build succeeded:

• Test summary