Add some scaffolding.

docker-compose.yml

@@ -0,0 +1,28 @@
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: notesvault
+      POSTGRES_USER: notesvault
+      POSTGRES_PASSWORD: notesvault
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U notesvault"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  api:
+    build: .
+    ports:
+      - "8080:8080"
+    environment:
+      SPRING_PROFILES_ACTIVE: postgres
+      DATASOURCE_URL: jdbc:postgresql://postgres:5432/notesvault
+      DATASOURCE_USERNAME: notesvault
+      DATASOURCE_PASSWORD: notesvault
+      JWT_SECRET: ${JWT_SECRET:?JWT_SECRET must be set}
+    depends_on:
+      postgres:
+        condition: service_healthy