Add Docker support with auto database initialization

src/main/resources/application.yml

@@ -3,9 +3,9 @@ spring:
     name: petshop-backend
 
   datasource:
-    url: ${DB_URL:jdbc:mysql://localhost:3306/petshop?createDatabaseIfNotExist=true}
-    username: ${DB_USERNAME:root}
-    password: ${DB_PASSWORD:password}
+    url: ${SPRING_DATASOURCE_URL:jdbc:mysql://localhost:3306/Petstoredb?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC}
+    username: ${SPRING_DATASOURCE_USERNAME:petshop}
+    password: ${SPRING_DATASOURCE_PASSWORD:petshop}
     driver-class-name: com.mysql.cj.jdbc.Driver
 
   jpa:
@@ -29,7 +29,7 @@ springdoc:
     path: /swagger-ui
 
 jwt:
-  secret: ${JWT_SECRET:your-256-bit-secret-key-change-this-in-production-min-32-chars}
+  secret: ${JWT_SECRET:change_me_please_make_this_at_least_32_characters_long_for_security}
   expiration: ${JWT_EXPIRATION:86400000}
 
 logging: