Add release notes generator

Closes gh-91

Author: philwebb

ci/pipeline.yml

@@ -44,6 +44,12 @@ resources:
     username: ((artifactory-username))
     password: ((artifactory-password))
     build_name: ((build-name))
+- name: github-release
+  type: github-release
+  source:
+    owner: spring-io
+    repository: spring-javaformat
+    access_token: ((github-release-notes-access-token))
 jobs:
 - name: build-spring-javaformat-ci-images
   plan:
@@ -112,13 +118,23 @@ jobs:
     file: git-repo/ci/tasks/stage.yml
     params:
       RELEASE_TYPE: RELEASE
+  - task: generate-release-notes
+    file: git-repo/ci/tasks/generate-release-notes.yml
+    params:
+      GITHUB_USERNAME: ((github-username))
+      GITHUB_TOKEN: ((github-release-notes-access-token))
   - put: artifactory-repo
     params:
       <<: *artifactory-params
       repo: libs-staging-local
   - put: git-repo
     params:
       repository: stage-git-repo
+  - put: github-release
+    params:
+      name: generated-release-notes/tag
+      tag: generated-release-notes/tag
+      body: generated-release-notes/release-notes
 - name: promote-release
   serial: true
   plan:

ci/scripts/generate-release-notes.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+
+version=$( cat built-artifact/version )
+
+java -jar /github-release-notes-generator.jar \
+  --releasenotes.github.username=${GITHUB_USERNAME} \
+  --releasenotes.github.password=${GITHUB_TOKEN} \
+  --releasenotes.github.organization=spring-io \
+  --releasenotes.github.repository=spring-javaformat  \
+  ${version} generated-release-notes/release-notes.md
+
+echo ${version} > generated-release-notes/version
+echo v${version} > generated-release-notes/tag

ci/tasks/generate-release-notes.yml

@@ -0,0 +1,17 @@
+---
+platform: linux
+image_resource:
+  type: docker-image
+  source:
+    repository: springio/github-release-notes-generator
+    tag: '0.0.2'
+inputs:
+- name: git-repo
+- name: built-artifact
+outputs:
+- name: generated-release-notes
+params:
+  GITHUB_USERNAME:
+  GITHUB_TOKEN:
+run:
+  path: git-repo/ci/scripts/generate-release-notes.sh