build(docs-infra): introduce new process for generating data for the …

…events page

This commit introduces a new process for generating data for the AIO
[events page](https://angular.io/events), which streamlines the process
and minimizes duplication and manual work. For more details, see
`aio/scripts/generate-events/README.md`.

aio/database.rules.json

@@ -0,0 +1,11 @@
+{
+  "rules": {
+    ".read": false,
+    ".write": false,
+
+    "events": {
+      ".read": true,
+      ".write": false
+    }
+  }
+}

aio/firebase.json

@@ -249,5 +249,8 @@
         ]
       }
     ]
+  },
+  "database": {
+    "rules": "database.rules.json"
   }
 }

aio/package.json

@@ -52,6 +52,7 @@
     "payload-size": "scripts/payload.sh",
     "predocs": "node scripts/contributors/validate-data && yarn generate-stackblitz && yarn generate-zips",
     "docs": "yarn docs-only",
+    "postdocs": "node scripts/generate-events/index.mjs --ignore-invalid-dates",
     "docs-only": "dgeni ./tools/transforms/angular.io-package",
     "docs-watch": "node tools/transforms/authors-package/watchr.js",
     "docs-lint": "eslint --ignore-path=\"tools/transforms/.eslintignore\" tools/transforms",

aio/scripts/deploy-to-firebase/index.mjs

@@ -383,7 +383,8 @@ function deploy(data) {
   firebase(`use "${projectId}"`);
   firebase('target:clear hosting aio');
   firebase(`target:apply hosting aio "${siteId}"`);
-  firebase(`deploy --only hosting:aio --message "Commit: ${currentCommit}" --non-interactive`);
+  firebase(
+      `deploy --only database,hosting:aio --message "Commit: ${currentCommit}" --non-interactive`);
 
   u.logSectionHeader('Run post-deploy actions.');
   postDeployActions.forEach(fn => fn(data));