Introduce ergomake

.ergomake/Dockerfile

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+FROM openjdk:18
+ARG DATABASE
+WORKDIR app
+COPY . .
+EXPOSE 8080
+ENV DATABASE ${DATABASE}
+CMD sh -c '/app/mvnw spring-boot:run -Dspring-boot.run.profiles=$DATABASE'

.ergomake/docker-compose.yml

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+version: '3.8'
+
+services:
+  h2-app:
+    build:
+      context: ..
+      dockerfile: .ergomake/Dockerfile
+      args:
+        - DATABASE=h2
+    ports:
+      - "8080:8080"
+  postgres-app:
+    build:
+      context: ..
+      dockerfile: .ergomake/Dockerfile
+      args:
+        - DATABASE=postgres
+    ports:
+      - "8081:8080"
+    environment:
+      - POSTGRES_URL=jdbc:postgresql://postgres/petclinic
+      - POSTGRES_USER=petclinic
+      - POSTGRES_PASS=petclinic
+  mysql-app:
+    build:
+      context: ..
+      dockerfile: .ergomake/Dockerfile
+      args:
+        - DATABASE=mysql
+    ports:
+      - "8082:8080"
+    environment:
+      - MYSQL_URL=jdbc:mysql://mysql/petclinic
+      - MYSQL_USER=petclinic
+      - MYSQL_PASS=petclinic
+  mysql:
+    image: mysql
+    ports:
+      - "3306"
+    environment:
+      - MYSQL_ROOT_PASSWORD=
+      - MYSQL_ALLOW_EMPTY_PASSWORD=true
+      - MYSQL_USER=petclinic
+      - MYSQL_PASSWORD=petclinic
+      - MYSQL_DATABASE=petclinic
+  postgres:
+    image: postgres
+    ports:
+      - "5432"
+    environment:
+      - POSTGRES_PASSWORD=petclinic
+      - POSTGRES_USER=petclinic
+      - POSTGRES_DB=petclinic