Check if dependency to external service for badges is desirable

[johannes-esr]

Currently, we depend on an external service to get the code coverage badges, see

openbsw/.ci/code_coverage.py

Lines 116 to 119 in ad718c0

	# FIXME: It's questionable whether we want to have a dependency to an
	# external service for generating these badges. This introduces a possible
	# cause of instabilities in case the external service becomes unavailable,
	# as already happened in the CI.

We'll have to discuss whether this is desirable or if we want to not depend on external services.