chore: test coverage

.github/workflows/test-coverage.yaml

@@ -0,0 +1,8 @@
+# call a workflow that runs covr::codecov() to calculate code coverage
+name: call-calc_coverage
+# on specifies the build triggers. See more info at https://docs.github.com/en/actions/learn-github-actions/events-that-trigger-workflows
+# The default is to run the workflow on every push or pull request to every branch.
+on: [push, pull_request]
+jobs:
+  call-workflow:
+    uses: nmfs-fish-tools/ghactions4r/.github/workflows/calc-coverage.yml@main

README.md

@@ -6,6 +6,7 @@
 
 <!-- badges: start -->
 [![R-CMD-check](https://github.com/pfmc-assessments/sa4ss/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/pfmc-assessments/sa4ss/actions/workflows/R-CMD-check.yaml)
+[![codecov](https://codecov.io/gh/pfmc-assessments/sa4ss/branch/main/graph/badge.svg)](https://app.codecov.io/gh/pfmc-assessments/sa4ss)
 <!-- badges: end -->
 
 # Table of contents