chore: update Node.js version in workflows to 22.x and restrict branch triggers for tests to main

- Updated Node.js version from 20.x to 22.x in promote.yaml and publish.yaml workflows.
- Changed branch triggers for test workflow from all branches to only the main branch.

Author: agoldis

.github/workflows/promote.yaml

@@ -22,7 +22,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: "20.x"
+          node-version: "22.x"
           registry-url: "https://registry.npmjs.org"
 
       - run: npm ci

.github/workflows/publish.yaml

@@ -27,7 +27,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: "20.x"
+          node-version: "22.x"
           registry-url: "https://registry.npmjs.org"
 
       - run: npm ci

.github/workflows/test.yml

@@ -2,9 +2,9 @@ name: Unit Tests
 
 on:
   push:
-    branches: ["**"]
+    branches: [main]
   pull_request:
-    branches: ["**"]
+    branches: [main]
 
 jobs:
   test: