Update version of docker-compose.yml

start_period in healthcheck and target in build are properties that are not supported for docker-compose versions <3.4. This change fixes this issue.

Signed-off-by: Efe Barlas <ebarlas@purdue.edu>

In our CI environment there is an artifical delay in between starting
the Rekor services via docker-compose and when the E2E tests are
actually executed due to Go modules being downloaded. In a local
development environment, the download may not be required so the tests
can start before the docker-compose services are actually running.

This introduces a healthcheck for services (where possible), and blocks
the start of the e2e tests until the services are reporting as healthy.
It also forces the use of an empty homedir and rekor config file to
ensure no collision between the tests and the developer's environment.

Fixes #183

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

This just exposes the default go metrics for now. We can use middleware to expose
more custom metrics for our API.

This is only toggled on for the server right now.

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

Co-authored-by: Dan Lorenc <dlorenc@google.com>

Signed-off-by: Bob Callaway <bcallawa@redhat.com>

This allows us to skip sticking it onto each request context and retrieving it.

Signed-off-by: Dan Lorenc <dlorenc@google.com>

Some changes:
- import names (app -> api, logging -> log)
- Commands package (cmd -> app)