Push to datadog & sentry in GH action build

[mattkrick]

AC

When a new version tag is pushed to GH & we dockerize the build, we should also push sourcemaps to sentry & datadog at the same time. This is currently done in CircleCI. We'll keep doing it in CircleCI & additionally do it in GH action build. We will entirely cut ties with CircleCI once we move to the new infra.