feat: Initial minimal docker compose and updates to release workflows.

docker/docker-compose.yaml

@@ -0,0 +1,22 @@
+
+services:
+  db:
+    image: docker.io/postgres:18
+    restart: unless-stopped
+    env_file: .env
+    volumes:
+      - ./data:/var/lib/postgresql
+  
+  app:
+    image: ghcr.io/m-housh/ductcalc:latest
+    restart: unless-stopped
+    env_file: .env
+    depends_on:
+      - db
+    ports:
+      - 8080:8080
+    healthcheck:
+      test: curl --fail --silent http://0.0.0.0:8080/health || exit 1
+      interval: 1m
+      timeout: 10s
+      retries: 3