Add Release pipeline for Milestone versions

This commit finishes the first step for migrating our complete build and
release pipeline to Concourse CI.

We're creating here a new "Release" jobs group in our pipeline.
We can now release Milestones from our pipeline with:

* the "stage-milestone" job, which creates and tags a new Milestone
version on the source repository, builds the artifacts and deploys them
in a staging repository and updates the version to the next SNAPSHOT.

* the "promote-milestone" fetches the build information from the staging
repository and promotes the released milestone in the official milestone
repository.

Interactions with the Artifactory and Bintray REST APIs are done using
the https://github.com/spring-io/concourse-release-scripts project.

Closes spring-projectsgh-22490

ci/images/setup.sh

@@ -11,6 +11,7 @@ rm -rf /var/lib/apt/lists/*
 
 curl https://raw.githubusercontent.com/spring-io/concourse-java-scripts/v0.0.3/concourse-java.sh > /opt/concourse-java.sh
 
+curl --output /opt/concourse-release-scripts.jar https://repo.spring.io/release/io/spring/concourse/releasescripts/concourse-release-scripts/0.1.0/concourse-release-scripts-0.1.0.jar
 
 ###########################################################
 # JAVA

ci/pipeline.yml

@@ -317,8 +317,51 @@ jobs:
               username: concourse-ci
     - put: repo-status-jdk15-build
       params: { state: "success", commit: "git-repo" }
+- name: stage-milestone
+  serial: true
+  plan:
+    - get: spring-framework-ci-image
+    - get: git-repo
+      trigger: false
+    - task: stage
+      image: spring-framework-ci-image
+      file: git-repo/ci/tasks/stage-version.yml
+      params:
+        RELEASE_TYPE: M
+        GRADLE_ENTERPRISE_ACCESS_KEY: ((gradle_enterprise_secret_access_key))
+        GRADLE_ENTERPRISE_CACHE_USERNAME: ((gradle_enterprise_cache_user.username))
+        GRADLE_ENTERPRISE_CACHE_PASSWORD: ((gradle_enterprise_cache_user.password))
+    - put: artifactory-repo
+      params:
+        <<: *artifactory-params
+        repo: libs-staging-local
+    - put: git-repo
+      params:
+        repository: stage-git-repo
+- name: promote-milestone
+  serial: true
+  plan:
+    - get: spring-framework-ci-image
+    - get: git-repo
+      trigger: false
+    - get: artifactory-repo
+      trigger: false
+      passed: [stage-milestone]
+      params:
+        download_artifacts: false
+        save_build_info: true
+    - task: promote
+      image: spring-framework-ci-image
+      file: git-repo/ci/tasks/promote-version.yml
+      params:
+        RELEASE_TYPE: M
+        ARTIFACTORY_SERVER: ((artifactory-server))
+        ARTIFACTORY_USERNAME: ((artifactory-username))
+        ARTIFACTORY_PASSWORD: ((artifactory-password))
 groups:
 - name: "Build"
   jobs: ["build", "jdk11-build", "jdk14-build", "jdk15-build"]
+- name: "Release"
+  jobs: ["stage-milestone", "promote-milestone"]
 - name: "CI Images"
   jobs: ["build-spring-framework-ci-images"]

ci/scripts/promote-version.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+source $(dirname $0)/common.sh
+
+version=$( cat artifactory-repo/build-info.json | jq -r '.buildInfo.modules[0].id' | sed 's/.*:.*:\(.*\)/\1/' )
+export BUILD_INFO_LOCATION=$(pwd)/artifactory-repo/build-info.json
+
+java -jar /opt/concourse-release-scripts.jar promote $RELEASE_TYPE $BUILD_INFO_LOCATION > /dev/null || { exit 1; }
+
+java -jar /opt/concourse-release-scripts.jar distribute $RELEASE_TYPE $BUILD_INFO_LOCATION > /dev/null || { exit 1; }
+
+echo "Promotion complete"
+echo $version > version/version

ci/scripts/stage-version.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+set -e
+
+source $(dirname $0)/common.sh
+repository=$(pwd)/distribution-repository
+
+pushd git-repo > /dev/null
+git fetch --tags --all > /dev/null
+popd > /dev/null
+
+git clone git-repo stage-git-repo > /dev/null
+
+pushd stage-git-repo > /dev/null
+
+snapshotVersion=$( awk -F '=' '$1 == "version" { print $2 }' gradle.properties )
+if [[ $RELEASE_TYPE = "M" ]]; then
+	stageVersion=$( get_next_milestone_release $snapshotVersion)
+	nextVersion=$snapshotVersion
+elif [[ $RELEASE_TYPE = "RC" ]]; then
+	stageVersion=$( get_next_rc_release $snapshotVersion)
+	nextVersion=$snapshotVersion
+elif [[ $RELEASE_TYPE = "RELEASE" ]]; then
+	stageVersion=$( get_next_release $snapshotVersion)
+	nextVersion=$( bump_version_number $snapshotVersion)
+else
+	echo "Unknown release type $RELEASE_TYPE" >&2; exit 1;
+fi
+
+echo "Staging $stageVersion (next version will be $nextVersion)"
+sed -i "s/version=$snapshotVersion/version=$stageVersion/" gradle.properties
+
+git config user.name "Spring Buildmaster" > /dev/null
+git config user.email "buildmaster@springframework.org" > /dev/null
+git add gradle.properties > /dev/null
+git commit -m"Release v$stageVersion" > /dev/null
+git tag -a "v$stageVersion" -m"Release v$stageVersion" > /dev/null
+
+./gradlew --no-daemon --max-workers=4 -PdeploymentRepository=${repository} build publishAllPublicationsToDeploymentRepository
+
+git reset --hard HEAD^ > /dev/null
+if [[ $nextVersion != $snapshotVersion ]]; then
+	echo "Setting next development version (v$nextVersion)"
+	sed -i "s/version=$snapshotVersion/version=$nextVersion/" gradle.properties
+	git add gradle.properties > /dev/null
+	git commit -m"Next development version (v$nextVersion)" > /dev/null
+fi;
+
+echo "Staging Complete"
+
+popd > /dev/null

ci/tasks/promote-version.yml

@@ -0,0 +1,18 @@
+---
+platform: linux
+inputs:
+- name: git-repo
+- name: artifactory-repo
+outputs:
+- name: version
+params:
+  RELEASE_TYPE:
+  ARTIFACTORY_SERVER:
+  ARTIFACTORY_USERNAME:
+  ARTIFACTORY_PASSWORD:
+  BINTRAY_SUBJECT:
+  BINTRAY_REPO:
+  BINTRAY_USERNAME:
+  BINTRAY_API_KEY:
+run:
+  path: git-repo/ci/scripts/promote-version.sh

ci/tasks/stage-version.yml

@@ -0,0 +1,17 @@
+---
+platform: linux
+inputs:
+- name: git-repo
+outputs:
+- name: stage-git-repo
+- name: distribution-repository
+params:
+  RELEASE_TYPE:
+  CI: true
+  GRADLE_ENTERPRISE_CACHE_USERNAME:
+  GRADLE_ENTERPRISE_CACHE_PASSWORD:
+  GRADLE_ENTERPRISE_URL: https://ge.spring.io
+caches:
+- path: gradle
+run:
+  path: git-repo/ci/scripts/stage-version.sh