Add beta branch support for releases (#282)

Updated release workflow and semantic-release config to include the beta
branch and pattern-matched branches for release automation. The beta
branch is now marked as a prerelease.

package.json

@@ -32,7 +32,11 @@
   "release": {
     "branches": [
       "+([0-9]).x",
-      "main"
+      "main",
+      {
+        "name": "beta",
+        "prerelease": true
+      }
     ],
     "plugins": [
       "@semantic-release/commit-analyzer",