ci: first attempt at adding a gated docker PR Publish (#1038) (#1041)

* ci: first attempt at adding a gated docker PR Publish (#1038)

* ci: first attempt at adding a gated docker PR Publish

* See if we can use contexts to inject variables after approval

* fix build command

* try alternative context

* docs: pull request template that spells out PR checklist

* change context back to Docker Hub

* Switch optional approval to another workflow

* Make docker builds faster

* Update .github/PULL_REQUEST_TEMPLATE/pull_request_template.md

Dockerfile

@@ -44,6 +44,7 @@ RUN yarn config set workspaces-experimental true
 RUN yarn install
 
 ENV PATH /usr/src/app/node_modules/.bin:$PATH
+ENV QUICK_BUILD true
 # ENV GENERATE_SOURCEMAP=false
 # ENV REACT_APP_CONFIG=config/default.js