align docker merge/pull/push github workflows so that CI/CD does not break

[rockett-m]

Affected Branch

trunk

Basic Diagnostics

• I've pulled the latest changes on the affected branch and the issue is still present.

• The issue is reproducible in docker

Description

On commits 210 and 211, all the 7/7 checks passed but docker merge failed after the commits were merged into trunk. We should never have this happen. Commit 212 resolved it for the time being, but we want to future-proof this.
Our docker pre-merge checks need to have equivalent steps to the docker merge stage to avoid unexpected failures after merge takes place. The docker-pull stage lags docker-merge.

We can see results of the docker merge github workflow on a push to our local branch. It can be replicated - adding an additional check to the 7 standard checks - by adding the last three lines below to .github/workflows/docker-merge.yml

on:
  push:
    branches:
      - 'trunk'
  pull-request:
    branches:
      - 'trunk'

To test github workflows install act and run act --list and then

act -j docker-build --container-architecture linux/amd64

cc discussion with @HalosGhost + @maurermi

Code of Conduct

• I agree to follow this project's Code of Conduct

[rockett-m]

@HalosGhost I'm happy to take this one on

[maurermi]

@rockett-m please feel free, if you could update us here with what you see in your investigation, that would be great!