Create test.yml workflow

.github/workflows/test.yml

@@ -0,0 +1,18 @@
+name: Test
+
+on:
+    push:
+      branches: [ "main" ]
+    pull_request:
+      branches: [ "main" ]
+
+jobs:
+    test:
+        name: Pester test
+        runs-on: ubuntu-latest
+        steps:
+            - name: Check out repository code
+              uses: actions/checkout@v4
+
+            - name: Run tests
+              run: Invoke-Pester -Output Detailed -PassThru