Update docker setup

[muffix]

Description

This fixes the Docker files in the repo so that it's possible and easy again to bring up Bosun and/or its dependencies in Docker. The docker-compose.yml file brings up three containers:

1. Redis
2. OpenTSDB + HBase
3. Bosun + scollector + tsdbrelay

Just run docker-compose -f docker/Dockerfile up.

This will eventually enable better testing.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

How has this been tested?

• [x] Built and started all containers individually
• [x] Started everything in one command with docker-compose

Checklist:

• [x] This contribution follows the project's code of conduct
• [x] This contribution follows the project's contributing guidelines
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] ~Any dependent changes have been merged and published in downstream modules~

[sonarcloud[bot]]

SonarCloud Quality Gate failed.

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0 Vulnerabilities (and 0 Security Hotspots to review)
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4.3% Duplication