Docker build failed

[eugenesimakin]

Hi folks,

I was trying to build the project with docker to push the image to a docker repo but the build failed:

Sending build context to Docker daemon  981.5kB
Step 1/12 : FROM gradle:jdk-alpine
 ---> 8017d8c2ba74
Step 2/12 : WORKDIR /home/gradle/project
 ---> Using cache
 ---> d3b9d5f4da94
Step 3/12 : EXPOSE 8080
 ---> Using cache
 ---> 64b5d259408a
Step 4/12 : USER root
 ---> Using cache
 ---> 4b54f6919a92
Step 5/12 : RUN apk update
 ---> Using cache
 ---> aff74c308198
Step 6/12 : ENV GRADLE_USER_HOME /home/gradle/project
 ---> Using cache
 ---> 961419bda82f
Step 7/12 : COPY . /home/gradle/project
 ---> 20280f86bff9
Step 8/12 : RUN gradle build
 ---> Running in f89f3fc54e02

Welcome to Gradle 5.4.1!

Here are the highlights of this release:
 - Run builds with JDK12
 - New API for Incremental Tasks
 - Updates to native projects, including Swift 5 support

For more details see https://docs.gradle.org/5.4.1/release-notes.html

Starting a Gradle Daemon (subsequent builds will be faster)

FAILURE: Build failed with an exception.

* Where:
Build file '/home/gradle/project/build.gradle' line: 2

* What went wrong:
An exception occurred applying plugin request [id: 'org.springframework.boot', version: '2.3.4.RELEASE']
> Failed to apply plugin [id 'org.springframework.boot']
   > Spring Boot plugin requires Gradle 5 (5.6.x only) or Gradle 6 (6.3 or later). The current version is Gradle 5.4.1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 15s

Environment: OS: Ubuntu 20.04 Docker version: 20.10.1, build 831ebea

[eugenesimakin]

I found the cause of the issue and fixed it in PR. This happens because gradle wrapper is not used in building process.