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

go-version-detect/README.md

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+# ivuorinen/actions/go-version-detect
+
+## Go Version Detect
+
+### Description
+
+Detects the Go version from the project's go.mod file or defaults to a specified version.
+
+### Inputs
+
+| name              | description                                              | required | default |
+| ----------------- | -------------------------------------------------------- | -------- | ------- |
+| `default-version` | <p>Default Go version to use if go.mod is not found.</p> | `false`  | `1.22`  |
+
+### Outputs
+
+| name         | description                            |
+| ------------ | -------------------------------------- |
+| `go-version` | <p>Detected or default Go version.</p> |
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/go-version-detect@main
+  with:
+    default-version:
+    # Default Go version to use if go.mod is not found.
+    #
+    # Required: false
+    # Default: 1.22
+```

go-version-detect/action.yml

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+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
+name: Go Version Detect
+description: "Detects the Go version from the project's go.mod file or defaults to a specified version."
+author: 'Ismo Vuorinen'
+
+branding:
+  icon: code
+  color: blue
+
+inputs:
+  default-version:
+    description: 'Default Go version to use if go.mod is not found.'
+    required: false
+    default: '1.22'
+
+outputs:
+  go-version:
+    description: 'Detected or default Go version.'
+    value: ${{ steps.detect-go-version.outputs.go-version }}
+
+runs:
+  using: composite
+  steps:
+    - name: Detect Go Version
+      id: detect-go-version
+      shell: bash
+      run: |
+        if [ -f go.mod ]; then
+          version=$(grep '^go ' go.mod | awk '{print $2}')
+          echo "Detected Go version: $version"
+          echo "go-version=$version" >> $GITHUB_OUTPUT
+        else
+          echo "No go.mod found. Using default Go version."
+          echo "go-version=${{ inputs.default-version }}" >> $GITHUB_OUTPUT
+        fi