Add GHA push workflow compose+dcmon test.

.github/workflows/push.yml

@@ -0,0 +1,25 @@
+name: Push
+
+on:
+  push: {}
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch: {}
+
+jobs:
+  compose-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: npm install
+        run: npm install
+
+      - name: Startup example
+        timeout-minutes: 2
+        run: time docker compose -p dcmon-test -f examples/docker-compose.yaml up -d
+
+      - name: dcmon
+        timeout-minutes: 5
+        run: time ./dcmon dcmon-test ./examples/checks.yaml