add .codecov.yml

Author: jakkdl

.codecov.yml

@@ -0,0 +1,25 @@
+# -- repository yaml --
+
+# Explicitly wait for all jobs to finish, as wait_for_ci prematurely triggers.
+# See https://github.com/python-trio/trio/issues/2689
+codecov:
+  notify:
+    # This number needs to be changed whenever the number of runs in CI is changed.
+    # Another option is codecov-cli: https://github.com/codecov/codecov-cli#send-notifications
+    after_n_builds: 78
+    wait_for_ci: false
+    notify_error: true # if uploads fail, replace cov comment with a comment with errors.
+  require_ci_to_pass: false
+
+# only post PR comment if coverage changes
+comment:
+  require_changes: true
+
+coverage:
+  # required range
+  range: 99.6..100
+  status:
+    # require patches to be 100%
+    patch:
+      default:
+        target: 100%