Use pre-built container in action

[muradsater]

It takes 40 seconds to build the Dockerfile on every github deploy. We can use the pre-built container (we already did this for the function-action)

[codecov]

Codecov Report

Merging #132 (6d1bf15) into main (5265fbe) will decrease coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
- Coverage   89.15%   88.67%   -0.48%     
==========================================
  Files          16       16              
  Lines         848      848              
==========================================
- Hits          756      752       -4     
- Misses         92       96       +4     

see 2 files with indirect coverage changes