Setup Docker Hub Automated Builds

[mcandre]

Fix the Docker (Hub) project setup so that Docker Hub automatically rebuilds and republishes the latest tag for new commits on the primary branch:

https://docs.docker.com/docker-hub/builds/

Tasks:

• Enable Autotest on Internal and external pull requests https://docs.docker.com/docker-hub/builds/automated-testing/#enable-automated-tests-on-a-repository
• Ensure that projects with multiply titled Docker images correctly update the corresponding images on Docker Hub
• Ensure that projects with multiply architectured images correctly update the corresponding images on Docker Hub
• Ensure that images are automatically rebuilt each day, in order to account for timely security patches
• Inquire about opportunity for Docker Scout to automatically notify repository owners when Automated Builds encounter security vulnerabilities

Possible that use of multiple build rules supports one-to-many repo to Docker image titles, and/or multi-architecture image collections.

If necessary, explore some combination of (GitHub Actions) CI/CD + Docker-in-Docker + tug to facilitate this.

Projects:

• octane
• snek
• tug
• valgrind-peak