Fix docker push

[Levi-Armstrong]

@marip8

[Levi-Armstrong]

@marip8 The issue I believe is that this is ${{ steps.meta.outputs.tags }} is now a list and running docker push on this variable it fails. I made a change in this PR but not sure how best to test it without merging. How did you originally test this?

[marip8]

I see. I've never had more than one tag be active at a time, so I hadn't run into this yet. I tested by opening a PR against my fork of the repository and merging it into my fork's master branch

[codecov]

Codecov Report

Merging #685 (62864c0) into master (9472545) will not change coverage.
The diff coverage is n/a.

❗ Current head 62864c0 differs from pull request most recent head 2f6f1dc. Consider uploading reports for the commit 2f6f1dc to get more accurate results

@@           Coverage Diff           @@
##           master     #685   +/-   ##
=======================================
  Coverage   92.36%   92.36%           
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  Files         172      172           
  Lines       10881    10881           
=======================================
  Hits        10050    10050           
  Misses        831      831