Add ability to fail a workflow

[irongut]

Feature Request

Add the ability to fail a workflow if the total coverage is below the lower threshold (when badge is red, default 50%).

Expected Behaviour

• An optional parameter will enable the Action to fail the workflow if the total coverage is below the lower threshold.
• The action should still output the coverage summary when failing the workflow.
• Use the lower threshold also used for badges & health indicators.

Additional Context

Linked To

#14 Add a health indicator for each package
#15 Add ability to change badge + health indicator thresholds

[irongut]

Example Markdown Output

Package	Line Rate	Branch Rate	Complexity	Health
Example	83%	69%	671	❌
Example.Interfaces	27%	100%	11	❌
Summary	83% (1212 / 1460)	69% (262 / 378)	682	❌

Minimum allowed line rate is 85%