[Feature Request] Add CORS middleware

[rambo]

RegEx to match the current deployment

rm_base = "https://replaceme.example.org" # FIXME read url from manifest
deployment_domain_regex = rm_base.replace(".", r"\.").replace("https://", r"https://(.*\.)?")
LOGGER.info("deployment_domain_regex={}".format(deployment_domain_regex))

app = FastAPI(docs_url="/api/docs", openapi_url="/api/openapi.json", version=__version__)
app.add_middleware(
    CORSMiddleware,
    allow_origin_regex=deployment_domain_regex,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)