chore(ci): add code coverage support (#54)

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<!-- Provide a brief summary of the changes -->

## Description
<!-- Provide a detailed description of the changes -->

This PR introduces Codecov to our CI for monitoring test coverage of
changes.

## References
<!-- Provide a list of any applicable references here (GitHub Issue,
[OpenFGA RFC](https://github.com/openfga/rfcs), other PRs, etc..) -->

## Review Checklist
- [x] I have clicked on ["allow edits by
maintainers"](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork).
- [ ] I have added documentation for new/changed functionality in this
PR or in a PR to [openfga.dev](https://github.com/openfga/openfga.dev)
[Provide a link to any relevant PRs in the references section above]
- [x] The correct base branch is being used, if not `main`
- [ ] I have added tests to validate that the change in functionality is
working as expected

.codecov.yml

@@ -0,0 +1,4 @@
+coverage:
+  precision: 2
+  range: "60...80"
+  round: down

.github/workflows/main.yaml

@@ -27,13 +27,20 @@ jobs:
         run: dotnet build --no-restore
 
       - name: Test
-        run: dotnet test --no-build --verbosity normal
+        run: dotnet test --no-build --verbosity normal --collect "Code Coverage"
 
-      - uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 #v4.3.1
+      - uses: actions/upload-artifact@26f96dfa697d77e81fd5907df203aa23a56210a8 #v4.3.1
         with:
           name: nuget-package
           path: src/OpenFga.Sdk/bin/Release/OpenFga.Sdk.*.nupkg
 
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@c16abc29c95fcf9174b58eb7e1abf4c866893bc8 # v4.1.1
+        continue-on-error: true
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: openfga/dotnet-sdk
+
   publish:
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags/v')
@@ -58,7 +65,7 @@ jobs:
       - name: Build
         run: dotnet build --no-restore --configuration Release
 
-      - uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 #v4.3.1
+      - uses: actions/upload-artifact@26f96dfa697d77e81fd5907df203aa23a56210a8 #v4.3.1
         with:
           name: nuget-package
           path: src/OpenFga.Sdk/bin/Release/OpenFga.Sdk.*.nupkg
@@ -78,7 +85,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: Roang-zero1/github-create-release-action@57eb9bdce7a964e48788b9e78b5ac766cb684803
+      - uses: Roang-zero1/github-create-release-action@57eb9bdce7a964e48788b9e78b5ac766cb684803 # v3.0.1
         with:
           version_regex: ^v[[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+
         env:

.openapi-generator/FILES

@@ -1,3 +1,4 @@
+.codecov.yml
 .editorconfig
 .fossa.yml
 .github/CODEOWNERS