Patch release adding convenient macro to import Go dependencies

Major fixes

• refactor go dependencies to a separate bzl file (#936)

New Rules

• Add new Starlark container load rule new_load.bzl (#929)

Features

• Implement new loader.go binary (#928)

Other Fixes

• Fix Bazel race condition in go binary release job. (#932)
• Add tests for new container_push (#931)
• Add loader to GCB release job. (#930)
• Clarify end user details for war_image macro (#926)
• Update docs with v0.8.0 release (#925)