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

stale/README.md

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+# ivuorinen/actions/stale
+
+## Stale
+
+### Description
+
+A GitHub Action to close stale issues and pull requests.
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/stale@main
+```

stale/action.yml

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+---
+name: Stale
+description: 'A GitHub Action to close stale issues and pull requests.'
+author: 'Ismo Vuorinen'
+
+branding:
+  icon: clock
+  color: yellow
+
+runs:
+  using: composite
+  steps:
+    - name: 🚀 Run stale
+      uses: actions/stale@v9.1.0
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        days-before-stale: 30
+        days-before-close: 7
+        remove-stale-when-updated: true
+        stale-issue-label: 'stale'
+        exempt-issue-labels: 'no-stale,help-wanted'
+        stale-issue-message: >
+          There hasn't been any activity on this issue recently, so we
+          clean up some of the older and inactive issues.
+
+          Please make sure to update to the latest version and
+          check if that solves the issue. Let us know if that works for you
+          by leaving a comment 👍
+
+          This issue has now been marked as stale and will be closed if no
+          further activity occurs. Thanks!
+        stale-pr-label: 'stale'
+        exempt-pr-labels: 'no-stale'
+        stale-pr-message: >
+          There hasn't been any activity on this pull request recently. This
+          pull request has been automatically marked as stale because of that
+          and will be closed if no further activity occurs within 7 days.
+          Thank you for your contributions.