handle container build correctly in PRs

[gilesknap]

No description provided.

[codecov]

Codecov Report

Merging #361 (9425135) into main (349c6e7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #361   +/-   ##
=======================================
  Coverage   89.21%   89.21%           
=======================================
  Files          25       25           
  Lines        1957     1957           
=======================================
  Hits         1746     1746           
  Misses        211      211           

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