action: update workflow to block low unit test coverage code

1. The project's unit test coverage cannot be reduced by more than 0.5%.
2. The unit test coverage of each patch must be higher than 75%.

Signed-off-by: Qinqi Qu <[email protected]>

.github/codecov.yml

@@ -0,0 +1,26 @@
+coverage:
+ status:
+ project:
+ default:
+ enabled: yes
+ target: auto # auto compares coverage to the previous base commit
+ # adjust accordingly based on how flaky your tests are
+ # this allows a 0.5% drop from the previous base commit coverage
+ threshold: 0.5%
+ patch:
+ default:
+ target: 75% # the required coverage value in each patch
+
+comment:
+ layout: "reach, diff, flags, files"
+ behavior: default
+ require_changes: false # if true: only post the comment if coverage changes
+
+codecov:
+ require_ci_to_pass: false
+ notify:
+ wait_for_ci: false
+
+# When modifying this file, please validate using
+
+# curl -X POST --data-binary @codecov.yml https://codecov.io/validate