feat(ci): Add GitHub Actions workflows for test automation and status badges

Add comprehensive test automation setup with GitHub Actions:
- Create test.yml for running tests on main/develop branches
- Add pr-test.yml for PR validation with test results comments
- Add update-badges.yml for dynamic test status badge updates
- Configure code coverage reporting with Codecov integration

Documentation:
- Add BADGE_SETUP.md with instructions for configuring test status badges
- Add WORKFLOWS_GUIDE.md explaining CI/CD workflow setup
- Update README.md with build and test status badges

Test Framework:
- Configure test project to use .NET 9.0
- Set up test coverage reporting with coverlet
- Add integration tests with WireMock for API mocking
- Add unit tests for configuration and HTTP client components
- Document testing strategy in TestingStrategy.md

Build:
- Add Dockerfile.test for containerized testing
- Update .gitignore for test artifacts
- Configure test dependencies in VRCAuthProxy.Tests.csproj

This change enables automated testing on PRs and branches, with visual status indicators and detailed test results in PR comments.

.github/workflows/pr-test.yml

@@ -0,0 +1,48 @@
+name: PR Tests
+
+on:
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: '9.0.x'
+        
+    - name: Restore dependencies
+      run: dotnet restore
+      
+    - name: Build
+      run: dotnet build --no-restore
+      
+    - name: Test with results
+      run: dotnet test --no-build --verbosity normal --logger "trx;LogFileName=test-results.trx" --results-directory ./TestResults
+      
+    - name: Test with coverage
+      run: dotnet test --no-build --verbosity normal /p:CollectCoverage=true /p:CoverletOutputFormat=lcov /p:CoverletOutput=./lcov.info
+      
+    - name: Upload coverage report to PR
+      uses: actions/upload-artifact@v4
+      with:
+        name: code-coverage-report
+        path: ./lcov.info
+        
+    - name: Comment PR with test results
+      uses: EnricoMi/publish-unit-test-result-action@v2
+      if: always()
+      with:
+        files: "**/TestResults/*.trx"
+        
+    - name: Add Coverage PR Comment
+      uses: codecov/codecov-action@v3
+      with:
+        file: ./lcov.info
+        fail_ci_if_error: false
+        verbose: true 

.github/workflows/test.yml

@@ -0,0 +1,46 @@
+name: Run Tests
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main, develop ]
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: '9.0.x'
+        
+    - name: Restore dependencies
+      run: dotnet restore
+      
+    - name: Build
+      run: dotnet build --no-restore
+      
+    - name: Test with coverage
+      run: dotnet test --no-build --verbosity normal /p:CollectCoverage=true /p:CoverletOutputFormat=lcov /p:CoverletOutput=./lcov.info
+      
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        file: ./lcov.info
+        fail_ci_if_error: false
+        
+    - name: Create status badge
+      if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+      uses: schneegans/dynamic-badges-action@v1.6.0
+      with:
+        auth: ${{ secrets.GIST_SECRET }}
+        gistID: ${{ secrets.GIST_ID }}
+        filename: vrcauthproxy-tests.json
+        label: tests
+        message: passing
+        color: success 

.github/workflows/update-badges.yml

@@ -0,0 +1,34 @@
+name: Update Badges
+
+on:
+  workflow_run:
+    workflows: ["Run Tests"]
+    types:
+      - completed
+  workflow_dispatch:
+
+jobs:
+  update-badges:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Update test status badge - Success
+        if: ${{ github.event.workflow_run.conclusion == 'success' }}
+        uses: schneegans/dynamic-badges-action@v1.6.0
+        with:
+          auth: ${{ secrets.GIST_SECRET }}
+          gistID: ${{ secrets.GIST_ID }}
+          filename: vrcauthproxy-tests.json
+          label: tests
+          message: passing
+          color: success
+          
+      - name: Update test status badge - Failure
+        if: ${{ github.event.workflow_run.conclusion == 'failure' }}
+        uses: schneegans/dynamic-badges-action@v1.6.0
+        with:
+          auth: ${{ secrets.GIST_SECRET }}
+          gistID: ${{ secrets.GIST_ID }}
+          filename: vrcauthproxy-tests.json
+          label: tests
+          message: failing
+          color: critical