Add github job to run tests

.github/workflows/ci.yml

@@ -0,0 +1,70 @@
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Cache NuGet packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
+      - name: Cache Docker image (postgres)
+        id: docker-cache
+        uses: actions/cache@v4
+        with:
+          path: /tmp/docker-postgres.tar
+          key: ${{ runner.os }}-docker-postgres-18.1
+
+      - name: Load cached postgres image or pull
+        run: |
+          if [ -f /tmp/docker-postgres.tar ]; then
+            docker load -i /tmp/docker-postgres.tar
+          else
+            docker pull postgres:18.1
+            docker save postgres:18.1 -o /tmp/docker-postgres.tar
+          fi
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build --no-restore --configuration Release
+
+      - name: Test with coverage
+        run: |
+          dotnet test --no-build --configuration Release \
+            --collect:"XPlat Code Coverage" \
+            --results-directory ./coverage \
+            -- DataCollectionRunSettings.DataCollectors.DataCollector.Configuration.Format=cobertura
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          directory: ./coverage
+          fail_ci_if_error: false
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+      - name: Upload coverage artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: ./coverage/**/coverage.cobertura.xml
+          retention-days: 7