Add codecoverage

Author: charleskawczynski

.github/codecov.yml

@@ -0,0 +1,11 @@
+comment: false
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        # this allows a 10% drop from the previous base commit coverage
+        threshold: 10%
+
+github_checks:
+    annotations: false

.github/workflows/CodeCov.yml

@@ -0,0 +1,43 @@
+name: CodeCov
+
+on:
+  push:
+    branches:
+      - main
+      - trying
+      - staging
+    tags: '*'
+  pull_request:
+
+jobs:
+  codecov:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/[email protected]
+
+    - name: Set up Julia
+      uses: julia-actions/setup-julia@latest
+      with:
+        version: 1.8
+
+    - name: Test with coverage
+      env:
+        JULIA_PROJECT: "@."
+      run: |
+        julia --project=@. -e 'using Pkg; Pkg.instantiate()'
+        julia --project=@. -e 'using Pkg; Pkg.test(coverage=true)'
+
+    - name: Generate coverage file
+      env:
+        JULIA_PROJECT: "@."
+      run: julia --project=@. -e 'using Pkg; Pkg.add("Coverage");
+                                  using Coverage;
+                                  LCOV.writefile("coverage-lcov.info", Codecov.process_folder())'
+      if: success()
+
+    - name: Submit coverage
+      uses: codecov/[email protected]
+      with:
+        token: ${{secrets.CODECOV_TOKEN}}
+      if: success()