feat(postgres): add shared database deployments

postgres/shared-compose.yaml

@@ -0,0 +1,28 @@
+services:
+  postgres:
+    image: postgres:15.19-alpine
+    container_name: homelab-postgres
+    restart: unless-stopped
+    env_file:
+      - .env
+    environment:
+      POSTGRES_DB: postgres
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: ${POSTGRES_ADMIN_PASSWORD:?set POSTGRES_ADMIN_PASSWORD}
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+      - ./initdb:/docker-entrypoint-initdb.d:ro
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres -d postgres"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - database
+
+volumes:
+  postgres-data:
+
+networks:
+  database:
+    name: homelab-database