ci: test gcp demo site build (#805)

* ci: test docs-publish

* Require unit tests for dry run

* ci: Make sure our docs publish is executable

* Try to correct path issue

* Try repo prefix

* Try as yarn command

* Need a workspace to attach to from previous step

* Add before we call our bash script

* See if we can enforce commands being available -- or just install locally?

* Try again

* Try SSH

* Include username in gh https url

* Note regarding failure on PR branches

* Remove docs publish from PR workflow

* chore: ability to specify an alternative html-template at build time

* chore: add command to build demo PWA website output

* chore: remove unused CI code

* Testing GCP capabilities

* syntax

* Naming

* naming

platform/viewer/package.json

@@ -20,6 +20,7 @@
     "build:package": "webpack --config .webpack/commonjs.prod.js",
     "build:viewer": "webpack --config .webpack/pwa.prod.js",
     "build:viewer:ci": "cross-env PUBLIC_URL=/pwa APP_CONFIG=config/netlify.js webpack --config .webpack/pwa.prod.js",
+    "build:viewer:demo": "cross-env PUBLIC_URL=/ APP_CONFIG=config/demo.js HTML_TEMPLATE=rollbar.html webpack --config .webpack/pwa.prod.js",
     "build:viewer:package": "yarn run build:package",
     "dev": "webpack-dev-server --config .webpack/all.dev.js -w",
     "dev:orthanc": "cross-env APP_CONFIG=config/docker_nginx-orthanc.js react-scripts start",