Stop publishing a Docker image

Closes gh-107

README.adoc

@@ -2,7 +2,7 @@
 
 To generate a markdown changelog that comprise the list of bugs and issues in a GitHub milestone follow these steps:
 
-- Download a https:/spring-io/github-changelog-generator/releases[release JAR] or use the https://hub.docker.com/r/springio/github-changelog-generator/[Docker image].
+- Download a https:/spring-io/github-changelog-generator/releases[release JAR].
 - Configure the application with the following properties:
 
 [source,yaml]

ci/pipeline.yml

@@ -29,13 +29,6 @@ resources:
  username: ((docker-hub-username))
  password: ((docker-hub-password))
  tag: main
-- name: github-changelog-generator-image
- type: docker-image
- icon: docker
- source:
- repository: springio/github-changelog-generator
- username: ((docker-hub-username))
- password: ((docker-hub-password))
 - name: github-release
  type: github-release
  icon: briefcase-download
@@ -62,14 +55,6 @@ jobs:
  - task: build
  image: ci-image
  file: git-repo/ci/tasks/build.yml
- - put: github-changelog-generator-image
- params:
- build: .
- dockerfile: git-repo/Dockerfile
- tag: built-artifact/version
- build_args:
- root: git-repo
- jar: built-artifact/github-changelog-generator.jar
 - name: release
  plan:
  - get: ci-image
@@ -86,14 +71,6 @@ jobs:
  - put: git-repo
  params:
  repository: release-git-repo
- - put: github-changelog-generator-image
- params:
- build: .
- dockerfile: git-repo/Dockerfile
- tag: built-artifact/version
- build_args:
- root: git-repo
- jar: built-artifact/github-changelog-generator.jar
  - put: github-release
  params:
  name: built-artifact/tag