Automate homebrew tap repo update

Closes gh-24677

ci/parameters.yml

@@ -3,6 +3,7 @@ email-from: "ci@spring.io"
 email-to: ["spring-boot-dev@pivotal.io"]
 github-repo: "https://github.com/spring-projects/spring-boot.git"
 github-repo-name: "spring-projects/spring-boot"
+homebrew-tap-repo: "https://github.com/spring-io/homebrew-tap.git"
 docker-hub-organization: "springci"
 artifactory-server: "https://repo.spring.io"
 branch: "2.3.x"

ci/pipeline.yml

@@ -73,6 +73,11 @@ anchors:
     silent: true
     icon_emoji: ":concourse:"
     username: concourse-ci
+  homebrew-tap-repo-resource-source: &homebrew-tap-repo-resource-source
+    uri: ((homebrew-tap-repo))
+    username: ((github-username))
+    password: ((github-password))
+    branch: master
 resource_types:
 - name: artifactory-resource
   type: registry-image
@@ -206,6 +211,11 @@ resources:
   type: time
   icon: clock-outline
   source: { interval: "24h" }
+- name: homebrew-tap-repo
+  type: git
+  icon: github
+  source:
+    <<: *homebrew-tap-repo-resource-source
 jobs:
 - name: build-ci-images
   plan:
@@ -614,11 +624,31 @@ jobs:
         RELEASE_TYPE: RELEASE
         BRANCH: ((branch))
         LATEST_GA: false
+- name: update-homebrew-tap
+  serial: true
+  plan:
+    - get: ci-image
+    - get: git-repo
+      resource: homebrew-tap-repo
+    - get: artifactory-repo
+      passed: [sync-to-maven-central]
+      params:
+        download_artifacts: false
+        save_build_info: true
+    - task: update-homebrew-tap
+      image: ci-image
+      file: git-repo/ci/tasks/update-homebrew-tap.yml
+      params:
+        LATEST_GA: false
+    - put: git-repo
+      resource: homebrew-tap-repo
+      params:
+        repository: updated-repo
 groups:
 - name: "builds"
   jobs: ["build", "jdk11-build", "jdk15-build", "windows-build"]
 - name: "releases"
-  jobs: ["stage-milestone", "stage-rc", "stage-release", "promote-milestone", "promote-rc", "promote-release", "sync-to-maven-central", "publish-to-sdkman"]
+  jobs: ["stage-milestone", "stage-rc", "stage-release", "promote-milestone", "promote-rc", "promote-release", "sync-to-maven-central", "publish-to-sdkman", "update-homebrew-tap"]
 - name: "ci-images"
   jobs: ["build-ci-images", "detect-docker-updates", "detect-jdk-updates", "detect-ubuntu-image-updates"]
 - name: "pull-requests"

ci/scripts/update-homebrew-tap.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+
+version=$( cat artifactory-repo/build-info.json | jq -r '.buildInfo.modules[0].id' | sed 's/.*:.*:\(.*\)/\1/' )
+
+git clone git-repo updated-repo > /dev/null
+
+if [[ $LATEST_GA = true ]]; then
+pushd updated-repo > /dev/null
+  cd homebrew-tap
+  wget https://repo.spring.io/libs-release-local/org/springframework/boot/spring-boot-cli/${version}/spring-boot-cli-${version}-homebrew.rb
+  rm spring-boot.rb
+  mv spring-boot-cli-*.rb spring-boot.rb
+  git config user.name "Spring Buildmaster" > /dev/null
+  git config user.email "buildmaster@springframework.org" > /dev/null
+  git add spring-boot.rb > /dev/null
+  git commit -m "Upgrade to Spring Boot ${version}" > /dev/null
+  echo "DONE"
+popd > /dev/null
+fi

ci/tasks/update-homebrew-tap.yml

@@ -0,0 +1,11 @@
+---
+platform: linux
+inputs:
+  - name: git-repo
+  - name: artifactory-repo
+outputs:
+  - name: updated-repo
+params:
+  LATEST_GA:
+run:
+  path: git-repo/ci/scripts/update-homebrew-tap.sh