feat: add GitHub Actions workflows for code quality and automation (#2)

csharp-lint-check/README.md

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+# ivuorinen/actions/csharp-lint-check
+
+## C# Lint Check
+
+### Description
+
+Runs linters like StyleCop or dotnet-format for C# code style checks.
+
+### Inputs
+
+| name             | description                        | required | default |
+| ---------------- | ---------------------------------- | -------- | ------- |
+| `dotnet-version` | <p>Version of .NET SDK to use.</p> | `false`  | `""`    |
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/csharp-lint-check@main
+  with:
+    dotnet-version:
+    # Version of .NET SDK to use.
+    #
+    # Required: false
+    # Default: ""
+```

csharp-lint-check/action.yml

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+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
+name: 'C# Lint Check'
+description: 'Runs linters like StyleCop or dotnet-format for C# code style checks.'
+author: 'Ismo Vuorinen'
+
+branding:
+  icon: 'code'
+  color: 'blue'
+
+inputs:
+  dotnet-version:
+    description: 'Version of .NET SDK to use.'
+    required: false
+
+runs:
+  using: composite
+  steps:
+    - name: Detect .NET SDK Version
+      uses: ivuorinen/actions/dotnet-version-detect@main
+      with:
+        default-version: '7.0'
+
+    - name: Setup .NET SDK
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: '${{ steps.detect-dotnet-version.outputs.dotnet-version }}'
+
+    - name: Install dotnet-format
+      shell: bash
+      run: dotnet tool install --global dotnet-format --version 7.0.1
+
+    - name: Run dotnet-format
+      shell: bash
+      run: |
+        set -eo pipefail
+        if ! dotnet format --check --report sarif --report-file dotnet-format.sarif; then
+          echo "::error::Code formatting issues found. Check the SARIF report for details."
+          exit 1
+        fi
+
+    - name: Upload SARIF Report
+      uses: github/codeql-action/upload-sarif@v2
+      with:
+        sarif_file: dotnet-format.sarif