Run npm tests in CI for PRs and master pushes

Update the pr-tests workflow to run when test files and package
manifests change, and when matching changes are pushed to master.

Run npm test before lint and build so CI validates Node unit tests
automatically for both pre-merge and post-merge flows.

Author: PeterDaveHello

.github/workflows/pr-tests.yml

@@ -9,6 +9,20 @@ on:
     paths:
       - "src/**"
       - "build.mjs"
+      - "tests/**"
+      - "package.json"
+      - "package-lock.json"
+      - ".github/workflows/pr-tests.yml"
+  push:
+    branches:
+      - "master"
+    paths:
+      - "src/**"
+      - "build.mjs"
+      - "tests/**"
+      - "package.json"
+      - "package-lock.json"
+      - ".github/workflows/pr-tests.yml"
 
 jobs:
   tests:
@@ -20,5 +34,6 @@ jobs:
         with:
           node-version: 20
       - run: npm ci
+      - run: npm test
       - run: npm run lint
       - run: npm run build