Add GitHub Actions workflows from DAppNodePackage-openclaw

[Copilot]

This repo was missing the standard DAppNode CI/CD workflows. Adds auto_check.yml and main.yml from DAppNodePackage-openclaw.

Workflows added

• auto_check.yml — Runs dappnodesdk github-action bump-upstream on a 4-hour cron and workflow_dispatch
• main.yml — Two jobs:
  • build-hash: posts IPFS hash on non-main branch pushes
  • release: publishes a patch release via ipfs-dev-gateway runner on main push or repository_dispatch

Adaptations

• DEVELOPER_ADDRESS uses ${{ secrets.DEVELOPER_ADDRESS }} rather than the hardcoded openclaw address
• Explicit permissions blocks added (contents: write, pull-requests: write, packages: write) per security best practices
• Clarified operator precedence in release job if condition with explicit parentheses

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