Implement docker-compose setup for CAcert software

docker-compose.yml

@@ -0,0 +1,39 @@
+---
+version: "3.8"
+services:
+  db:
+    build:
+      context: .
+      dockerfile: mariadb.Dockerfile
+    env_file:
+      - ./.env
+    volumes:
+      - db:/var/lib/mysql
+    ports:
+      - "13306:3306"
+    healthcheck:
+      test: out=$$(mysqladmin ping -h localhost -P 3306 -u root -p$$MYSQL_ROOT_PASSWORD 2>&1); echo $$out | grep 'mysqld is alive' || { echo $$out ; exit 1 ; }
+  smtp:
+    build:
+      context: .
+      dockerfile: smtp.Dockerfile
+    volumes:
+      - maildir:/home/catchall/Maildir
+  application:
+    build:
+      context: .
+      dockerfile: application.Dockerfile
+    env_file:
+      - ./.env
+    ports:
+      - "8080:80"
+      - "8443:443"
+    depends_on:
+      - db
+      - smtp
+    volumes:
+      - ./cacert-software:/www
+
+volumes:
+  db: { }
+  maildir: { }