Add docker-compose.yaml alongside .yml

The stack manager looks for the .yaml spelling for this stack; keep both
in sync so it works regardless of which one it reads.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docker-compose.yaml

@@ -0,0 +1,19 @@
+services:
+  power-compare-mcdowall:
+    image: git.plexultra.com/dlawler489/power-compare:main
+    ports:
+      - "44597:8000"
+    env_file:
+      # See the power-compare repo's docker-compose.yml for why this is an
+      # /app/data/... path rather than a real host path: the stack manager
+      # runs `docker compose` inside its own container, so paths here
+      # resolve against ITS filesystem (mounted from
+      # /Users/davidlawler/docker/dockhand on the host), not the real host's.
+      - /app/data/power-compare-mcdowall-persistent/.env
+    environment:
+      - DB_PATH=/data/power_compare.db
+    volumes:
+      # Bind-mount SOURCE, by contrast, is resolved by the real Docker
+      # daemon against the actual host filesystem -- a real host path.
+      - /Users/davidlawler/docker/power-compare-mcdowall-data/data:/data
+    restart: unless-stopped