* Update ember-cli to ~3.20

* Remove bad optional-feature

* Remove ember-fetch dep

* re-install ember-fetch

* update model fragments pr

* update ember model fragments correct package name

* update ember composable helpers to solve array helper error

* update ember-concurrency

* add back engine dependencies, automatically removed during ember-cli-upgrade

* make author-form-options component js file otherwise error

* for now comment out withTestWaiter

* add eslint-node and fix if not with unless in templates

* fix linting for tab index of false is now -1 and add type button to all buttons without types

* fix href errors for linting, likely have to come back and fix

* using eslint fix flag to fix all this.gets

* ember modules codemode removed files that had module twice, will fix in next commit

* finish codemode ember-data-codemod needed to rename const model

* more this.get removal codemode did not work

* cont...

Saving and restoring the go cache was an experiment to reduce build times, but it worked too inconsistently. (#10493)

Name environments after their use case rather than their size.  We need fewer resources for remote-docker because all the heavy work happens in the remote-docker VMs which we can't configure.  Use a different env for race tests which are more resoure hungry. (#10492)

Remove darwin/386 since Go 1.15 doesn't support it.  Remove some 1.14.7 references that were missed. (#10321)

* ci: use docker mirror (source)

* ci: use docker mirror (gen)

* Update go version to 1.15.3

* Fix OU ordering for go1.15.x testing

* Fix CI version

* Update docker image

* Fix test

* packagespec upgrade -version 0.1.8
Co-authored-by: Sam Salisbury <samsalisbury@gmail.com>

* packagespec v0.1.2 - prep: remove unneeded code

* packagespec v0.1.2 - packagespec init

* packagespec v0.1.2 - make packages

* packagespec v0.1.3 - make packages

* add packagespec build system

- The majority of changes in this commit are files generated
  by packagespec (everything in the packages-oss.lock directory).

* add .yamllint

* update to packagespec@fd54aea4

* ci: bust packagespec cache

- Change to packagespec results in package IDs that can use
  git tag refs, not just commit refs.

* update to packagepsec@5fc121d0

- This busts all caches, because of a change to the way we
  no longer traverse from tag refs to commit refs, due to
  the potential confusion this can cause.
- See https://github.com/hashicorp/packagespec/commit/fd54aea4827bb6cfd637c78a2ab6274111605330
  for the original change to packagespec necessitating this.

* update to packagespec@5e6c87b6

- This completes the change to allowing git tag refs
  to be used for source IDs, begun in f130b940a8fbe3e9398225b08ea1d63420bef7b6

* update to packagespec@4d3c9e8b

- This busts cache, needed to apply previous change.

* remove RELEASE_BUIL...

Use a more minimal bootstrap target when running in CI: just what we need to satisfy our job needs.  Also remove govendor which we no longer use. (#8808)

* improve website docker image build

* update image tag technique

* generate ci file

* skip test-go and test-go-race workflows when branch starts with ui/ or docs/

* ci: add context to website-docker-image job

* ci: test context value

* ci: revert test context value

* new documentation website

* ci job adjustment

* update to latest version on downloads page

* remove transition-period scripts

* add netlify toml file

* fix docs patch

* fix ci config?

* revert go.mod changes

* a couple last markdown formatting fixes

set JOBS=2 to prevent memory errors; see https://github.com/emberjs/ember.js/issues/15641#issuecomment-328496408 (#8152)

* ci: switch to go1.12.12 on machine executors

- This brings in recent ci changes from the release/1.2.x branch.

* go mod vendor

* ci: remove ent build tags

* ci: fix gopath

* go mod vendor

* ci: ensure yarn install

* ci: add debug commands

* ci: debugging

* ci: increment yarn cache; remove debugging

* ci: remove redundant yarn install