Add Antora based docs-build

.github/workflows/deploy-docs.yml

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+name: Deploy Docs
+run-name: ${{ format('{0} ({1})', github.workflow, github.event.inputs.build-refname || 'all') }}
+on:
+  workflow_dispatch:
+    inputs:
+      build-refname:
+        description: Enter git refname to build (e.g., 5.7.x).
+        required: false
+  push:
+    branches: docs-build
+env:
+  GRADLE_ENTERPRISE_SECRET_ACCESS_KEY: ${{ secrets.GRADLE_ENTERPRISE_SECRET_ACCESS_KEY }}
+permissions:
+  contents: write
+jobs:
+  build:
+    if: github.repository_owner == 'spring-projects'
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 5
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+    - name: Set up refname build
+      if: github.event.inputs.build-refname
+      run: |
+        git fetch --depth 1 https://github.com/$GITHUB_REPOSITORY ${{ github.event.inputs.build-refname }}
+        export BUILD_REFNAME=${{ github.event.inputs.build-refname }}
+        echo "BUILD_REFNAME=$BUILD_REFNAME" >> $GITHUB_ENV
+        export BUILD_VERSION=$(git cat-file --textconv FETCH_HEAD:pom.xml | python3 -c "import xml.etree.ElementTree as xml; from sys import stdin; print(xml.parse(stdin).getroot().find('{http://maven.apache.org/POM/4.0.0}version').text)")
+        echo BUILD_VERSION=$BUILD_VERSION >> $GITHUB_ENV
+    - name: Run Antora
+      run: |
+        ./mvnw antora
+    - name: Publish Docs
+      uses: spring-io/spring-doc-actions/rsync-antora-reference@v0.0.11
+      with:
+        docs-username: ${{ secrets.DOCS_USERNAME }}
+        docs-host: ${{ secrets.DOCS_HOST }}
+        docs-ssh-key: ${{ secrets.DOCS_SSH_KEY }}
+        docs-ssh-host-key: ${{ secrets.DOCS_SSH_HOST_KEY }}
+        site-path: target/antora/site
+    - name: Bust Cloudflare Cache
+      uses: spring-io/spring-doc-actions/bust-cloudflare-antora-cache@v0.0.11
+      with:
+        context-root: spring-batch
+        cloudflare-zone-id: ${{ secrets.CLOUDFLARE_ZONE_ID }}
+        cloudflare-cache-token: ${{ secrets.CLOUDFLARE_CACHE_TOKEN }}

.gitignore

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+target/
+.settings/
+.project
+.classpath
+*.orig
+.springBeans
+.factorypath
+.sts4-cache
+.ant-targets-build.xml
+src/ant/.ant-targets-upload-dist.xml
+*.sonar4clipse*
+.DS_Store
+*.iml
+*.ipr
+*.iws
+/.idea/
+*.graphml
+node_modules
+node/
+package-lock.json
+package.json

.mvn/wrapper/maven-wrapper.properties

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+#Thu Apr 06 16:16:22 CEST 2023
+distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.1/apache-maven-3.9.1-bin.zip

.sdkmanrc

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+# Use sdkman to run "sdk env" to initialize with correct JDK version
+# Enable auto-env through the sdkman_auto_env config
+# See https://sdkman.io/usage#config
+# A summary is to add the following to ~/.sdkman/etc/config
+# sdkman_auto_env=true
+java=17.0.3-tem

README.adoc

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+= Spring Batch Docs Build
+
+You're currently viewing the Antora playbook branch.
+The playbook branch hosts the docs build that is used to build and publish the production docs site.
+
+The Spring Batch reference docs are built using https://antora.org[Antora].
+This README covers how to build the docs in a software branch as well as how to build the production docs site locally.
+
+== Building the Site
+
+You can build the entire site by invoking the following on the docs-build branch and then viewing the site at `target/antora/site/index.html`
+
+[source,bash]
+----
+mvn antora
+----
+
+== Building a Specific Branch
+
+[source,bash]
+----
+mvn antora
+----

antora-playbook.yml

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+antora:
+  extensions:
+  - '@springio/antora-extensions/partial-build-extension'
+  - require: '@springio/antora-extensions/latest-version-extension'
+  - require: '@springio/antora-extensions/inject-collector-cache-config-extension'
+  - '@antora/collector-extension'
+  - '@antora/atlas-extension'
+  - require: '@springio/antora-extensions/root-component-extension'
+    root_component_name: 'batch'
+site:
+  title: Spring Batch
+  url: https://docs.spring.io/spring-batch/reference
+  robots: allow
+git:
+  ensure_git_suffix: false
+content:
+  sources:
+  - url: https://github.com/spring-projects/spring-batch
+    # Refname matching:
+    # https://docs.antora.org/antora/latest/playbook/content-refname-matching/
+    branches: [ main,'({5..9}).+({1..9}).x' ]
+    tags: [ 'v({5..9}).+({0..9}).+({0..9})?(-{RC,M}+({0..9}))', '!(v5.0.+({0..9})?(-{RC,M}+({0..9})))','!(v5.1.0-M1)' ]
+    start_path: spring-batch-docs
+asciidoc:
+  attributes:
+    page-stackoverflow-url: https://stackoverflow.com/tags/spring-batch
+    page-pagination: ''
+    hide-uri-scheme: '@'
+    tabs-sync-option: '@'
+  extensions:
+  - '@asciidoctor/tabs'
+  - '@springio/asciidoctor-extensions'
+urls:
+  latest_version_segment_strategy: redirect:to
+  latest_version_segment: ''
+  redirect_facility: httpd
+ui:
+  bundle:
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.3.3/ui-bundle.zip
+    snapshot: true
+runtime:
+  log:
+    failure_level: warn
+    format: pretty