CI pipeline for tests/linting and building/tagging image

[clshaw01]

Add config for bitbucket and GitHub actions with the following steps:

• [x] Linting and formatting checks
• [x] Unit tests for backend
• [x] Unit tests for frontend
• [ ] Build container images
• [ ] Push images to ECR repo

1. Refactor test targets in the Makefile to use Dagger instead. This will enable us to test the pipeline locally and use the same configuration when running in various pipelines.
2. Use ttl.sh, an ephemeral image registry, to test building and pushing images locally.

[daveoconnor]

When building container images we need to pass build information as a RELEASE arg to docker.

docker build --build-arg RELEASE=$commit_sha ...

This is to add release support distinction for sentry tracking/reporting.