[WIP] Add Snapshot Checker job to GitHub Actions workflow

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Create pull requests in the following repositories to add/update the GitHub Actions workflow .github/workflows/snapshot_check.yml implementing the “Snapshot Checker” job.

Repositories and required EXECUTION_CLIENT value:

• dappnode/DAppNodePackage-geth-generic -> geth
• dappnode/DAppNodePackage-reth-generic -> reth
• dappnode/DAppNodePackage-erigon-generic -> erigon
• dappnode/DAppNodePackage-nethermind-generic -> nethermind
• dappnode/DAppNodePackage-besu-generic -> besu

Workflow requirements (same across repos except EXECUTION_CLIENT):

• File path: .github/workflows/snapshot_check.yml
• Content:

name: Snapshot Checker

on:
  schedule:
    - cron: '0 */6 * * *'
  workflow_dispatch:

jobs:
  snapshot-check-docker:
    runs-on: staking-test-hoodi
    steps:
      - name: Run Snapshot Checker (Docker)
        run: |
          docker run --rm --pull=always \
            -v /var/run/docker.sock:/var/run/docker.sock \
            -v /var/lib/docker/volumes:/var/lib/docker/volumes \
            -e EXECUTION_CLIENT='<SET_PER_REPO>' \
            -e NETWORK=hoodi \
            -e LOG_LEVEL=debug \
            ghcr.io/dappnode/staker-test-util/snapshot-checker:latest

• If the file already exists, update only the EXECUTION_CLIENT value to the correct one and keep the rest consistent.
• Ensure YAML formatting remains valid.

PR expectations:

• One PR per repository.
• PR title: Add snapshot checker workflow
• PR description should mention the repo-specific EXECUTION_CLIENT.

Notes:

• Base branch is main.

This pull request was created from Copilot chat.

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