[token-server] Add Dockerfile for CI deployments

Summary: Add Dockerfile for CI deployments. Modify tsconfig to exclude the test/ dir in builds (not needed and was throwing errors as the docker instance cannot find the local ref of mock-chronik-client)

Test Plan:

docker build -t token-server_local .
docker run --init --rm --name token-server token-server_local

and app starts

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D15661