build: update to support BETA releases

https://github.com/orgs/AlaskaAirlines/discussions/556

This diff modifies the `.github/settings.yml`, `.github/workflows/testPublish.yml`,
and `package.json` files.

In `.github/settings.yml`, it adds a `required_linear_history` setting to
the `main` and `beta` branches to prevent merge commits from being
pushed to those branches.

In `.github/workflows/testPublish.yml`, it updates the `branches` section to
include both `main` and `beta` branches for the `push` and `pull_request` events.

In `package.json`, it adds a `beta` branch with the `prerelease` flag set to
`true` in the `release.branches` section.

Changes to be committed:
modified:   .github/settings.yml
modified:   .github/workflows/testPublish.yml
modified:   package.json

.github/settings.yml

@@ -39,7 +39,7 @@ repository:
   allow_rebase_merge: true
 
 branches:
-  - name: main
+  - &default_protection
     # https://developer.github.com/v3/repos/branches/#update-branch-protection
     # Branch Protection settings. Set to null to disable
     protection:
@@ -60,11 +60,19 @@ branches:
         # Required. Require branches to be up to date before merging.
         strict: true
         # Required. The list of status checks to require in order to merge into this branch
-        ccontexts: ["test (18.x)", "test (20.x)", "license/cla"]
+        contexts: ["test (18.x)", "test (20.x)", "license/cla"]
       # Required. Enforce all configured restrictions for administrators. Set to true to enforce required status checks for repository administrators. Set to null to disable.
       enforce_admins: false
       # Required. Restrict who can push to this branch. Team and user restrictions are only available for organization-owned repositories. Set to null to disable.
       restrictions: null
+      # Prevent merge commits from being pushed to matching branches
+      required_linear_history: true
+
+  - name: main
+    <<: *default_protection
+
+  - name: beta
+    <<: *default_protection
 
 # Labels: define labels for Issues and Pull Requests
 labels:

.github/workflows/testPublish.yml

@@ -4,9 +4,9 @@ name: Test and publish
 # events but only for the main branch
 on:
   push:
-    branches: [ main ]
+    branches: [ main, beta ]
   pull_request:
-    branches: [ main ]
+    branches: [ main, beta ]
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
@@ -29,7 +29,7 @@ jobs:
 
   release:
     # Only release on push to main
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main' || 'refs/heads/beta'
     runs-on: ubuntu-latest
     needs: test
     steps:

package.json

@@ -101,7 +101,13 @@
   },
   "release": {
     "branches": [
-      "main"
+      {
+        "name": "main"
+      },
+      {
+        "name": "beta",
+        "prerelease": true
+      }
     ],
     "plugins": [
       "@semantic-release/commit-analyzer",