Add code coverage (#8)

* Add code coverage support to PR build workflow

- Add coverageThreshold and coverageReportFormats input parameters
- Enhance test step to collect XPlat Code Coverage data
- Integrate Codecov for coverage report uploads
- Add CodeCoverageSummary action for markdown reports with badges
- Include sticky PR comments for coverage visibility

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Remove Codecov upload step from coverage workflow

- Remove codecov/codecov-action@v4 step that required token
- Keep GitHub-native coverage summary and PR comments
- Simplifies workflow by removing external dependency

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Add test reporting and artifact upload for coverage

- Add dorny/test-reporter for GitHub-native test result display
- Keep artifact upload as backup coverage report access
- Replace problematic PR comment approach with better alternatives

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Remove problematic test reporter step

- Remove dorny/test-reporter that also had permission issues
- Keep only coverage summary and artifact upload
- Simplify workflow to avoid GitHub permission problems

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Make code coverage optional based on threshold value

- Add separate test step for when coverage is disabled (threshold = 0)
- Update coverage-related steps to only run when threshold > 0
- Allows projects to run tests without coverage overhead when not needed

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: ncipollina

.github/workflows/pr-build.yaml

@@ -57,6 +57,16 @@ on:
         required: false
         default: false
         type: boolean
+      coverageThreshold:
+        description: "Minimum code coverage percentage required"
+        required: false
+        default: 0
+        type: number
+      coverageReportFormats:
+        description: "Coverage report formats (cobertura, opencover, lcov)"
+        required: false
+        default: "cobertura"
+        type: string
       runCdk:  # ✅ New input to control CDK execution
         description: "Determines if AWS CDK steps should be run"
         required: false
@@ -98,8 +108,42 @@ jobs:
         run: dotnet build --configuration Release --no-restore
 
       - name: Test Code
-        if: inputs.hasTests == true  # ✅ Run only if hasTests is set to true
-        run: dotnet test --no-restore
+        if: inputs.hasTests == true && inputs.coverageThreshold == 0
+        run: dotnet test --no-restore --configuration Release
+
+      - name: Test Code with Coverage
+        if: inputs.hasTests == true && inputs.coverageThreshold > 0
+        run: |
+          dotnet test --no-restore \
+            --collect:"XPlat Code Coverage" \
+            --results-directory ./coverage \
+            --logger trx \
+            --configuration Release \
+            -- DataCollectionRunSettings.DataCollectors.DataCollector.Configuration.Format=${{ inputs.coverageReportFormats }}
+
+      - name: Code Coverage Summary
+        if: inputs.hasTests == true && inputs.coverageThreshold > 0
+        uses: irongut/CodeCoverageSummary@v1.3.0
+        with:
+          filename: coverage/**/coverage.cobertura.xml
+          badge: true
+          fail_below_min: ${{ inputs.coverageThreshold > 0 }}
+          format: markdown
+          hide_branch_rate: false
+          hide_complexity: true
+          indicators: true
+          output: both
+          thresholds: '${{ inputs.coverageThreshold }} 80'
+
+      - name: Upload Coverage Report as Artifact
+        if: inputs.hasTests == true && inputs.coverageThreshold > 0
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: |
+            ./coverage/**/*
+            code-coverage-results.md
+          retention-days: 30
 
       - name: Setup Local .NET Tools
         if: inputs.functions != '[]'