Add dummy mappy action

.github/workflows/at2-testing-hello-mappy.yaml

@@ -0,0 +1,27 @@
+name: mappy hello world
+
+on:
+  # Runs every time a PR is open against master
+  pull_request:
+    branches: [ master ]
+    types: [opened, synchronize, labeled, ready_for_review, reopened]
+  workflow_dispatch:
+
+jobs:
+  hello-mappy:
+    if: ${{ github.event.repository.name == 'scream' }}
+    runs-on: [self-hosted, mappy]
+
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          show-progress: false
+      - name: Show action trigger
+        run: |
+          echo "= The job was automatically triggered by a ${{github.event_name}} event."
+      - name: greet the world
+        run: echo "hello world"
+      - name: list mods
+        run: module list