Cookiecutter improvements

[sanderegg]

What do these changes do?

Important stuff

• adds several flavors of dockerfiles:
  • official python docker images python: python:3.6(-slim), python:3.7(-slim), python:3.8(-slim)
  • official ubuntu docker image: ubuntu:18.04
  • alpine docker (NOTE: only to use with services that already are based on alpine): alpine:3.7, alpine:3.8
  • more flavors can be added easily
• use 1 single yaml file for metadata in metadata/metadata.yml
• The services generated need an updated version of the sidecar as the logs are now to be retrieved through the docker interface (see here)
• versioning:
  • use make version-service-patch version-service-minor version-service-major to update the version of the service
  • use make integration-service-patch integration-service-minor integration-service-major to update the version of the integration (should not happen that often)

less important

• Migrated CI from Travis to Github Actions, which tests generation using python 3.6-3.8
• update shell scripts with shellcheck
• update tests, all flavors are tested
• New Makefiles following simcore conventions

Not totally tested stuff

• publishing
• integration with github/travis/gitlab

Related issue number

Implementing #11

How to test

pip install cookiecutter
cookiecutter gh:sanderegg/cookiecutter-osparc-service -c pcrespov-is11/improvements-over-osparc-python

fill the form and follow the usage steps in the README.md