Deploy to cloud run on push to main

[aomarks]

This configuration automatically deploys the catalog and site servers to Google Cloud Run whenever a commit is pushed to main.

To test this right now you'll need to have privileges on our GCP project, and then you can run the following command to establish authenticated proxies, and then visit http://localhost:5453 and http://localhost:6453

(gcloud beta run services proxy --project=webcomponents-org-test --region=us-west2 --port=5453 site \
& gcloud beta run services proxy --project=webcomponents-org-test --region=us-west2 --port=6453 catalog)

Also:

• Fixes another dependency that was in the wrong package.json
• Adds the GCP_PROJECT_ID environment variable to the catalog server since it was hard-coded before

Open issues (non-blocking for this PR):

• We get Error: 7 PERMISSION_DENIED: Missing or insufficient permissions. errors when trying to use the "bootstrap-packages" endpoint (despite setting up liberal privileges in the firebase console)
• The URL is still hard-coded to the wrong value on the client side, so search can't work. We'll need to update https://github.com/webcomponents/webcomponents.org/blob/c192d08f73e3f3a6c647ff178d5a44d27fa5e9a9/packages/site-client/src/components/wco-catalog-search.ts#L16
• We'll want a separate, slightly different configuration for generating PR previews

Part of https://github.com/webcomponents/webcomponents.org/issues/1340 Part of https://github.com/webcomponents/webcomponents.org/issues/1339