add codecov.yml

Signed-off-by: Young Bu Park <youngp@microsoft.com>

codecov.yml

@@ -0,0 +1,23 @@
+codecov:
+  require_ci_to_pass: yes
+
+coverage:
+  precision: 2
+  round: down
+  range: "65...100"
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: no
+
+ignore:
+  - "**/*mock*"
+  - "pkg/armrpc/rpctest/*"
+  - "pkg/datamodel/*.go"
+  - "**/zz_*"