[Feature]: Add workflow template for docker builds and pushing to various container registries

[jimbrig]

• Initialize workflow template:

  • docker.yml
  • docker.properties.json (name, description, iconName, and filePatterns)
    • add file patterns for ^Dockerfile, ^docker-compose.yml, ^compose.yml, etc.
  • docker.svg

• For workflow, add following jobs:

  • Checkout repository
  • Setup Docker BuildX (driver opts)
  • Login to Registry (matrix: DockerHub, GHCR, ACR, GCR)
  • Extract Docker metadata
  • Build and push Docker image

---

For Azure, need the following variables/secrets:

• Registry URL (i.e. https://<registryName>.azurecr.io) (secrets.AZ_ACR_URL)
• Admin Username (secrets.AZ_ACR_USERNAME)
• Admin Password (secrets.AZ_ACR_PASSWORD)
• Tags:
  • <registryName>.azurecr.io/${{ secrets.AZ_ACR_USERNAME }}/<repoName>:${{ github.sha }}
  • <registryName>.azurecr.io/${{ secrets.AZ_ACR_USERNAME }}/<repoName>:latest