fix: Remove load option from Docker workflow publish steps

[matthewfeickert]

Description

Fix for PR #1441 in which load and push can not be used simultaneously for the docker/build-push-action@v2 action. So remove load as the image isn't needed locally.

Push the build result to a registry (--push)

Shorthand for --output=type=registry. Will automatically push the
build result to registry.

Load the single-platform build result to docker images (--load)

Shorthand for --output=type=docker. Will automatically load the
single-platform build result to docker images.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Remove load from docker/build-push-action@v2 action publish steps
   - load and push can not be used in the same step
   - load option: Shorthand for --output=type=docker
* Amends PR #1441

[codecov]

Codecov Report

Merging #1442 (d4615c1) into master (5693d27) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1442   +/-   ##
=======================================
  Coverage   97.63%   97.63%           
=======================================
  Files          63       63           
  Lines        3967     3967           
  Branches      555      555           
=======================================
  Hits         3873     3873           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
contrib	25.58% <ø> (ø)
unittests	97.40% <ø> (ø)

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