add Dockerfiles and docker-compose to run full system in docker

cmd/accrual/Dockerfile

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+FROM golang:1.20-alpine as builder
+
+WORKDIR /app
+COPY . /app
+
+RUN go clean --modcache
+RUN go mod download
+RUN CGO_ENABLED=0 GOOS=linux go build -o accrual ./cmd/accrual/main.go
+
+FROM golang:alpine
+
+COPY --from=builder /app/accrual .
+
+EXPOSE 8081
+
+CMD ["./accrual"]

cmd/gophermart/Dockerfile

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+FROM golang:1.20-alpine as builder
+
+WORKDIR /app
+COPY . /app
+
+RUN go clean --modcache
+RUN go mod download
+RUN CGO_ENABLED=0 GOOS=linux go build -o gophermart ./cmd/gophermart/main.go
+
+FROM golang:alpine
+
+COPY --from=builder /app/gophermart .
+
+EXPOSE 8080
+
+CMD ["./gophermart"]

docker-compose.yml

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+version: '3.9'
+services:
+  db:
+    image: postgres:latest
+    container_name: "database"
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+      - POSTGRES_DB=postgres
+    ports:
+      - "35432:5432"
+
+  accrual:
+    build:
+      dockerfile: cmd/accrual/Dockerfile
+      context: .
+    container_name: "accrual"
+    environment:
+      DATABASE_URI: postgres://postgres:postgres@db:5432/postgres
+      RUN_ADDRESS: :8081
+    ports:
+      - "8081:8081"
+    depends_on:
+      - db
+
+  gophermart:
+    build:
+      dockerfile: cmd/gophermart/Dockerfile
+      context: .
+    container_name: "gophermart"
+    environment:
+      DATABASE_URI: postgres://postgres:postgres@db:5432/postgres
+      RUN_ADDRESS: :8080
+      ACCRUAL_SYSTEM_ADDRESS: http://accrual:8081
+    ports:
+      - "8080:8080"
+    depends_on:
+      - db