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

npm-publish/README.md

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+# ivuorinen/actions/npm-publish
+
+## Publish to NPM
+
+### Description
+
+Publishes the package to the NPM registry with configurable scope and registry URL.
+
+### Inputs
+
+| name              | description                         | required | default                                |
+| ----------------- | ----------------------------------- | -------- | -------------------------------------- |
+| `registry-url`    | <p>Registry URL for publishing.</p> | `false`  | `https://registry.npmjs.org/`          |
+| `scope`           | <p>Package scope to use.</p>        | `false`  | `@ivuorinen`                           |
+| `package-version` | <p>The version to publish.</p>      | `false`  | `${{ github.event.release.tag_name }}` |
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/npm-publish@main
+  with:
+    registry-url:
+    # Registry URL for publishing.
+    #
+    # Required: false
+    # Default: https://registry.npmjs.org/
+
+    scope:
+    # Package scope to use.
+    #
+    # Required: false
+    # Default: @ivuorinen
+
+    package-version:
+    # The version to publish.
+    #
+    # Required: false
+    # Default: ${{ github.event.release.tag_name }}
+```

npm-publish/action.yml

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+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
+name: Publish to NPM
+description: 'Publishes the package to the NPM registry with configurable scope and registry URL.'
+author: 'Ismo Vuorinen'
+
+branding:
+  icon: package
+  color: green
+
+inputs:
+  registry-url:
+    description: 'Registry URL for publishing.'
+    required: false
+    default: 'https://registry.npmjs.org/'
+  scope:
+    description: 'Package scope to use.'
+    required: false
+    default: '@ivuorinen'
+  package-version:
+    description: 'The version to publish.'
+    required: false
+    default: ${{ github.event.release.tag_name }}
+
+runs:
+  using: composite
+  steps:
+    - name: Setup Node.js
+      uses: ivuorinen/actions/node-setup@main
+
+    - name: Authenticate NPM
+      shell: bash
+      run: |
+        echo "//${{ inputs.registry-url }}/:_authToken=${{ secrets.NPM_TOKEN }}" > ~/.npmrc
+
+    - name: Publish Package
+      shell: bash
+      env:
+        NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+      run: |
+        pkg_version=$(node -p "require('./package.json').version")
+        if [ "$pkg_version" != "${{ inputs.package-version }}" ]; then
+          echo "Version mismatch: package.json ($pkg_version) != input (${{ inputs.package-version }})"
+          exit 1
+        fi
+
+        # Dry run first
+        npm publish \
+          --registry ${{ inputs.registry-url }} \
+          --dry-run \
+          --scope ${{ inputs.scope }}
+
+        npm publish \
+          --registry ${{ inputs.registry-url }} \
+          --verbose \
+          --scope ${{ inputs.scope }} \
+          --tag ${{ inputs.package-version }}