build: use standalone executable to avoid dotnet runtime

[mcmcgrath13]

PULL REQUEST

Summary

Instead of using a dotnet runtime, use a python-slim base. This is enabled by using the publish command instead of build in the build phase of the fhir-converter-service and asking for a standalone linux executable.

Also:

• build only the tool instead of the whole repo.
• add cachebusting of only the python service part of the image so you can avoid a dotnet rebuild when not working on that part of the code

Depends on skylight-hq/FHIR-Converter#12

Additional Information

Converter build step timings
before: 3m45s
after: 1m30s

Checklist

• If this code affects the other scrum team, have they been notified? (In Slack, as reviewers, etc.)

[BobanL]

Nice fix!