Merge pull request #39695 from ixdy/docker-build-pull
Automatic merge from submit-queue (batch tested with PRs 39695, 37054, 39627, 39546, 39615)
Always --pull in docker build to ensure recent base images
**What this PR does / why we need it**: By default, Docker will use a locally cached image rather than looking for a newer image. This can be problematic when using a common base image like debian:jessie, since you may end up unintentionally using a very old base image.
I think everything here is only used on release paths, so it shouldn't affect any regular development workflows.
**Release note**:
```release-note
NONE
```
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