Add DOCUMENT_DOWNLOAD_API_HOST_NAME_INTERNAL to the Dockerfile

[spatel033]

Add missing DOCUMENT_DOWNLOAD_API_HOST_NAME_INTERNAL to the dockerfile

[quis]

Do you also need DOCUMENT_DOWNLOAD_API_HOST, per:

notifications-admin/app/config.py

Lines 147 to 150 in 9d64dfa

	DOCUMENT_DOWNLOAD_API_HOST = os.environ.get("DOCUMENT_DOWNLOAD_API_HOST", "http://localhost:7000")
	DOCUMENT_DOWNLOAD_API_HOST_NAME_INTERNAL = os.environ.get(
	"DOCUMENT_DOWNLOAD_API_HOST_NAME_INTERNAL", "http://localhost:7000"
	)

?

Or if that variable is unused, can we delete it?