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

dotnet-version-detect/README.md

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+# ivuorinen/actions/dotnet-version-detect
+
+## Dotnet Version Detect
+
+### Description
+
+Detects .NET SDK version from global.json or defaults to a specified version.
+
+### Inputs
+
+| name              | description                                                         | required | default |
+| ----------------- | ------------------------------------------------------------------- | -------- | ------- |
+| `default-version` | <p>Default .NET SDK version to use if global.json is not found.</p> | `true`   | `7.0`   |
+
+### Outputs
+
+| name             | description                                  |
+| ---------------- | -------------------------------------------- |
+| `dotnet-version` | <p>Detected or default .NET SDK version.</p> |
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/dotnet-version-detect@main
+  with:
+    default-version:
+    # Default .NET SDK version to use if global.json is not found.
+    #
+    # Required: true
+    # Default: 7.0
+```

dotnet-version-detect/action.yml

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+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
+name: Dotnet Version Detect
+description: 'Detects .NET SDK version from global.json or defaults to a specified version.'
+
+inputs:
+  default-version:
+    description: 'Default .NET SDK version to use if global.json is not found.'
+    required: true
+    default: '7.0'
+
+outputs:
+  dotnet-version:
+    description: 'Detected or default .NET SDK version.'
+    value: ${{ steps.detect-dotnet-version.outputs.dotnet-version }}
+
+runs:
+  using: composite
+  steps:
+    - name: Detect .NET SDK Version
+      id: detect-dotnet-version
+      shell: bash
+      run: |
+        if [ -f global.json ]; then
+          version=$(jq -r '.sdk.version' global.json)
+          if [ "$version" != "null" ]; then
+            echo "Detected .NET SDK version: $version"
+            echo "dotnet-version=$version" >> $GITHUB_OUTPUT
+          else
+            echo "No version specified in global.json. Using default."
+            echo "dotnet-version=${{ inputs.default-version }}" >> $GITHUB_OUTPUT
+          fi
+        else
+          echo "global.json not found. Using default."
+          echo "dotnet-version=${{ inputs.default-version }}" >> $GITHUB_OUTPUT
+        fi