build(docker): add docker support

Dockerfile

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+FROM golang:1.16-buster AS builder
+
+WORKDIR /src/app
+
+# install system dependencies
+RUN apt-get update \
+  && apt-get -y install netcat \
+  && apt-get clean
+
+COPY go.* ./
+RUN go mod download
+COPY . . 
+
+ARG TARGETOS
+ARG TARGETARCH
+
+RUN GOOS=${TARGETOS} GOARCH=${TARGETARCH}  go build -o dblab .
+
+FROM scratch AS bin
+
+LABEL org.opencontainers.image.documentation="https://github.com/danvergara/dblab" \
+	org.opencontainers.image.source="https://github.com/danvergara/dblab" \
+	org.opencontainers.image.title="dblab"
+
+COPY --from=builder /src/app/dblab /bin/dblab

docker-compose.yml

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+version: "3.9"
+
+services:
+  postgres:
+    image: postgres:12.1-alpine
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=users
+    ports:
+      - '5432:5432'
+    networks:
+      - dblab
+
+  dblab:
+    build:
+      context: .
+      target: builder
+    depends_on:
+      - postgres
+    environment:
+      - DB_HOST=postgres
+      - DB_USER=postgres
+      - DB_PASSWORD=password
+      - DB_NAME=users
+      - DB_PORT=5432
+      - DB_DRIVER=postgres
+    entrypoint: ["/bin/bash", "./scripts/entripoint.dev.sh"]
+    networks:
+      - dblab
+
+networks:
+  dblab:

scripts/entripoint.dev.sh

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+#!/bin/bash
+
+set -e
+
+echo "Waiting for postgres..."
+
+while ! nc -z postgres 5432; do
+  sleep 0.1
+done
+
+echo "PostgreSQL started"
+
+echo "Runinng the migrations against the DB"
+go run cmd/dbmigrate/main.go
+
+echo "Seeding the database"
+go run cmd/seeder/main.go seed