nginx-golang-mysql: add dev envs support (#274)

* Add Docker Desktop Development Environments config
* Use nginx image with read-only bind mount instead of building a
  custom image
* Upgrade Go dependencies

Co-authored-by: Guillaume Lours <guillaume@lours.me>
Signed-off-by: Milas Bowman <milas.bowman@docker.com>
Signed-off-by: Andrew Maguire <andrewm4894@gmail.com>

nginx-golang-mysql/.docker/docker-compose.yaml

@@ -0,0 +1,50 @@
+services:
+  backend:
+    build:
+      context: backend
+      target: dev-envs
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    secrets:
+      - db-password
+    depends_on:
+      db:
+        condition: service_healthy
+
+  db:
+    image: mariadb:10-focal
+    command: '--default-authentication-plugin=mysql_native_password'
+    restart: always
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "127.0.0.1", "--silent"]
+      interval: 3s
+      retries: 5
+      start_period: 30s
+    secrets:
+      - db-password
+    volumes:
+      - db-data:/var/lib/mysql
+    environment:
+      - MYSQL_DATABASE=example
+      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db-password
+    expose:
+      - 3306
+
+  proxy:
+    image: nginx
+    volumes:
+      - type: bind
+        source: ./proxy/nginx.conf
+        target: /etc/nginx/conf.d/default.conf
+        read_only: true
+    ports:
+      - 80:80
+    depends_on: 
+      - backend
+
+volumes:
+  db-data:
+
+secrets:
+  db-password:
+    file: db/password.txt