feat(docker): reduce image size

[jonperron]

Fix for #322

Changes

First commit: Add a .dockerignore file which allows not to take useless folders and files in the docker image.

Allow to reduce the image size from 596 MB to 524 MB.

REPOSITORY                                        TAG               IMAGE ID       CREATED          SIZE
boavizta/boaviztapi                               1.3.7             3f6ba5cfaf75   5 seconds ago    524MB
<none>                                            <none>            ef9616799172   5 hours ago      596MB

Second commit: Write Dockerfile in order to reduce amount of copied files. Also add function in main.py to find location of pyproject.toml so it does not break local uvicorn and docker run executions.
Allow to reduce the image size to 460 MB.

REPOSITORY                                        TAG               IMAGE ID       CREATED          SIZE
boavizta/boaviztapi                               1.3.7             d18abd68b352   5 minutes ago    460MB

Tests

Tested after creating a new build using make docker-build

docker run -p 5000:5000/tcp boavizta/boaviztapi:`poetry version -s`
INFO:     Started server process [1]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://0.0.0.0:5000 (Press CTRL+C to quit)

Tested using uvicorn

uvicorn boaviztapi.main:app --host=localhost --port 5000
INFO:     Started server process [1133308]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://localhost:5000 (Press CTRL+C to quit)