Add write permissions to sync-metadata workflow

[Copilot]

The sync-metadata workflow could not push commits. It had git add and git commit commands but lacked repository write permissions.

Changes

• Added permissions: contents: write to .github/workflows/sync-metadata.yml

name: Sync Metadata

on:
  workflow_dispatch:

permissions:
  contents: write

jobs:
  sync:
    # ...

The workflow can now push automated updates to static/parameters.json and static/providers.json.

Original prompt

The workflow is not committing the changes. Probably because it doesn't git add the changes. Pls fix.

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[Copilot]

Pull request overview

This PR adds write permissions to the sync-metadata workflow to enable it to push automated commits. The workflow generates static/parameters.json and static/providers.json files from the meteostat-python repository and commits them back to the docs repository, but it previously lacked the necessary GitHub Actions permissions to push those commits.

Changes:

• Added permissions: contents: write to the workflow-level permissions in .github/workflows/sync-metadata.yml

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