Create publish pipeline using RGM

[guicaulada]

Open-source pipeline

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1. Create command to publish docker images
2. Create command to publish packages
3. Create command to extract npm artifacts
4. Create command to publish npm artifacts
5. Create command to publish deb packages
6. Create command to publish rpm packages
7. Create command to publish packages to grafana.com

Enterprise pipeline

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1. Create command to publish assets to GitHub
2. Create command to publish assets to AWS Marketplace
3. Create command to create private artifacts page

Use the pipelines

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1. Use the RGM publish pipeline on grafana/grafana for a nightly release
2. Use the RGM publish pipeline on grafana/grafana-enterprise for a nightly release
3. Replace release publish pipelines to use RGM