Add docker support

Dockerfile

@@ -0,0 +1,19 @@
+FROM golang:1.20.3 as builder
+
+# Create and change to the app directory.
+WORKDIR /app
+COPY go.* ./
+RUN go mod download
+
+COPY . ./
+
+RUN CGO_ENABLED=0 GOOS=linux go build -mod=readonly -v -o server
+
+FROM alpine:3
+RUN apk add --no-cache ca-certificates
+
+COPY --from=builder /app/server /server
+ENV PORT=8080
+EXPOSE 8080
+
+ENTRYPOINT ["/server"]

docker-compose.yml

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+version: "3.9"
+services:
+  backend:
+    build:
+      context: .
+      dockerfile: ./Dockerfile
+    ports:
+      - "7000:8080"
+    environment:
+      - URL=http://localhost:7000