GitLab

refs DE-608

When we pull the experimental syntax docker image, buildkit can fail with the error “failed to solve with frontend gateway.v0: frontend grpc server closed unexpectedly”. We don’t actually need buildkit or the experimental syntax for this image, so stop using it.

Test Plan:
1. Linters passes in main build.
2. Linters fails when webpack file size is wrong.
3. Linters uploads image when upload directive specified.

Change-Id: I6b508cbf7fc42d0d93b066804ba07dc994b9625d
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/262734

Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Aaron Ogata <aogata@instructure.com>
Product-Review: Aaron Ogata <aogata@instructure.com>
Reviewed-by: Kyle Rosenbaum <krosenbaum@instructure.com>