Add github workflow to publish to gh-pages branch

This should auto process the bikeshed on push to main and publish
to the gh-pages branch.

Also updating the WebIDL to pass validation.

.github/workflows/auto-publish.yml

@@ -0,0 +1,19 @@
+name: CI
+on:
+  pull_request: {}
+  push:
+    branches: [main]
+jobs:
+  main:
+    name: Build, Validate and Deploy
+    runs-on: ubuntu-20.04
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v3
+      - uses: w3c/spec-prod@v2
+        with:
+          TOOLCHAIN: bikeshed
+          GH_PAGES_BRANCH: gh-pages
+          SOURCE: docs/spec.bs
+          DESTINATION: index.html

README.md

@@ -9,4 +9,4 @@ const attestation = await navigator.getEnvironmentIntegrity("...");
 
 The [explainer](./explainer.md) goes gives a high level overview of the proposal.
 
-The [spec](./docs/spec) currently describes how this is being prototyped in Chromium.
+The [spec](./docs/spec.bs) currently describes how this is being prototyped in Chromium.

docs/spec.bs

@@ -71,6 +71,7 @@ stores state in the [=Integrity verdict=] that can be used for cross site tracki
 ## {{AttesterConnection}} ## {#attester-connection}
 
 <xmp class="idl">
+  [Exposed=Window]
   interface AttesterConnection {
     ArrayBuffer getAttestation(DOMString contentBinding);
   };
@@ -111,6 +112,7 @@ stores state in the [=Integrity verdict=] that can be used for cross site tracki
 ## {{EnvironmentIntegrity}} ## {#environment-integrity}
 
 <xmp class="idl">
+  [Exposed=Window]
   interface EnvironmentIntegrity {
     readonly attribute ArrayBuffer attestationToken;
     DOMString encode();