Support linux/amd64 docker images

[prathapsridharan]

if you run make build for the test_app (copied into another directory and renamed as something else. see: https://github.com/chanzuckerberg/virtual-cells-platform), then you get the following error on Macs with M1/M2 (arm64 architectures):

% make build
rm -rf dist/*.whl
docker compose build
[+] Building 0.7s (2/2) FINISHED                                                                                                      docker:desktop-linux
 => [graphql-api internal] load build definition from Dockerfile                                                                                      0.0s
 => => transferring dockerfile: 596B                                                                                                                  0.0s
 => ERROR [graphql-api internal] load metadata for ghcr.io/chanzuckerberg/platformics:latest                                                          0.7s
------
 > [graphql-api internal] load metadata for ghcr.io/chanzuckerberg/platformics:latest:
------
failed to solve: ghcr.io/chanzuckerberg/platformics:latest: failed to resolve source metadata for ghcr.io/chanzuckerberg/platformics:latest: no match for platform in manifest: not found
make: *** [build] Error 17