first commit. added CI, Docker compose, blank client and server. used unit tests, they pass

deploy/.env.example

@@ -0,0 +1,8 @@
+# Copy to .env and adjust.
+
+MESSENGER_ENV=production
+MESSENGER_ALLOWED_ORIGINS=https://msg.example.com
+
+POSTGRES_USER=messenger
+POSTGRES_PASSWORD=change-me
+POSTGRES_DB=messenger

deploy/docker-compose.yml

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+services:
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: messenger/api:latest
+    restart: unless-stopped
+    environment:
+      MESSENGER_ENV: ${MESSENGER_ENV:-production}
+      MESSENGER_HTTP_ADDR: ":8080"
+      MESSENGER_ALLOWED_ORIGINS: ${MESSENGER_ALLOWED_ORIGINS:-}
+    ports:
+      - "8080:8080"
+    depends_on:
+      postgres:
+        condition: service_healthy
+
+  postgres:
+    image: postgres:17-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-messenger}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-messenger}
+      POSTGRES_DB: ${POSTGRES_DB:-messenger}
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    ports:
+      - "127.0.0.1:5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-messenger} -d ${POSTGRES_DB:-messenger}"]
+      interval: 5s
+      timeout: 3s
+      retries: 10
+
+volumes:
+  pgdata: