CI: report with CWL conformance test badges

[mr-c]

Like (full example)

For GitHub Actions you can build the badge.net URL manually for inclusion in a report artifact

Example: https://badgen.net/badge/command_line_tool/97%25/yellow?icon=commonwl

For inclusion in documentation about the level of CWL support, then the test results need storing at a publicly accessible URL and the docs should reference that dynamic URL like https://badgen.net/https/raw.githubusercontent.com/tom-tan/conformance/master/conformance/ep3/cwl_v1.0/ep3_latest/command_line_tool.json?icon=commonwl

The badge JSON format is simple

{"subject": "command_line_tool", "status": "97%", "color": "yellow"}