:four_leaf_clover: `Proposal`: New plugin gitlab-pipeline

[xavier-hou]

What Would You Like to Add? Why Is This Needed?

The current gitlab plugin only supports golang, I would like to add a plugin for the java language. This plugin is for Gitlab-Java's pipeline workflow.

Design

exmaple .gitlab-ci.yml

image: docker:stable

stages:
  - package
  - docker_build
  - k8s_deploy
  
mvn_package_job:
  image: maven:3.6.2-jdk-14
  stage: package
  tags:
    - java-demo
  script: 
    - mvn clean package -B
  artifacts:
    paths:
      - target/*.jar

docker_build_job:
  image: docker:latest
  stage: docker_build
  tags: 
    - java-demo
  script:
    - docker login -u hxcdockerhub -p GITLAB_TOKEN
    - docker build -t hxcdockerhub/java-demo:$CI_PIPELINE_ID .
    - docker push hxcdockerhub/java-demo:$CI_PIPELINE_ID
     
k8s_deploy_job:
  image: 
    name: bitnami/kubectl:latest
    entrypoint: [""]
  stage: k8s_deploy
  tags: 
    - java-demo
  script:
    - kubectl config get-contexts
    - kubectl config use-context hxcGit/java-demo:hxc
    - cd manifests
    - sed -i "s/IMAGE_TAG/$CI_PIPELINE_ID/g" deployment.yaml
    - cat deployment.yaml
    - kubectl apply -f deployment.yaml

Option struct

// Options is the struct for configurations of the gitlabci-java plugin.
type Options struct {
	PathWithNamespace string   `validate:"required"`
	Branch            string   `validate:"required"`
	BaseURL           string   `validate:"omitempty,url"`
	Package           *Package `validate:"required"`
	Build             *Build   `validate:"required"`
	Deploy            *Deploy  `validate:"required"`
}

type BaseOption struct {
	Enable bool `validate:"required"`
	Image  string
	Tags   string
}

type Package struct {
	BaseOption    `validate:"required"`
	ScriptCommand []string
}

type Build struct {
	BaseOption `validate:"required"`
	UserName   string
	ImageName  string

	ScriptCommand []string
}

type Deploy struct {
	BaseOption    `validate:"required"`
	ScriptCommand []template.HTML
	K8sAgentName  string
}

Anything else