Copy default antora files

docs/modules/.github/workflows/deploy-docs.yml

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+name: Deploy Docs
+on:
+  push:
+    branches-ignore: [ gh-pages ]
+    tags: '**'
+  repository_dispatch:
+    types: request-build-reference # legacy
+  #schedule:
+  #- cron: '0 10 * * *' # Once per day at 10am UTC
+  workflow_dispatch:
+permissions:
+  actions: write
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    # FIXME: enable when pushed to spring-projects
+    # if: github.repository_owner == 'spring-projects'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          ref: docs-build
+          fetch-depth: 1
+      - name: Dispatch (partial build)
+        if: github.ref_type == 'branch'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh workflow run deploy-docs.yml -r $(git rev-parse --abbrev-ref HEAD) -f build-refname=${{ github.ref_name }}
+      - name: Dispatch (full build)
+        if: github.ref_type == 'tag'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh workflow run deploy-docs.yml -r $(git rev-parse --abbrev-ref HEAD)

docs/modules/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: 'shell' # FIXME: Change this to match `name:` in antora.yml
+      # FIXME: Run antora once using this extension to migrate to the Asciidoc Tabs syntax
+      # and then remove this extension
+    - require: '@springio/antora-extensions/tabs-migration-extension'
+      unwrap_example_block: always
+      save_result: true
+site:
+  title: Spring Shell # FIXME: Change to your Project's title
+  url: https://docs.spring.io/spring-shell/reference/ # FIXME: Change to your Project's URL
+content:
+  sources:
+    - url: ./..
+      branches: HEAD
+      # FIXME: Change this to the path to the directory containing antora.yml in your project
+      # See https://docs.antora.org/antora/latest/playbook/content-source-start-path/#start-path-key
+      start_path: spring-shell-docs
+      worktrees: true
+asciidoc:
+  attributes:
+    # FIXME: Change to your stackoverflow URL or remove
+    page-stackoverflow-url: https://stackoverflow.com/tags/spring-shell
+    page-pagination: ''
+    hide-uri-scheme: '@'
+    tabs-sync-option: '@'
+    chomp: 'all'
+  extensions:
+    - '@asciidoctor/tabs'
+    - '@springio/asciidoctor-extensions'
+  sourcemap: true
+urls:
+  latest_version_segment: ''
+runtime:
+  log:
+    failure_level: warn
+    format: pretty
+ui:
+  bundle:
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.3.4/ui-bundle.zip

docs/modules/antora.yml

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+name: shell # FIXME: Change to your project name typically just remove spring- from the artifact name
+version: true
+title: Spring Shell # FIXME: Change to the title of your Project's docs
+nav:
+  - modules/ROOT/nav.adoc
+ext:
+  collector:
+    run:
+      # FIXME Change "command" to the command that generates your antora.yml and other antora resources
+      # See https://gitlab.com/antora/antora-collector-extension/-/blob/main/docs/modules/ROOT/pages/configuration-keys.adoc?ref_type=heads#collector-reference
+      # HINT: Maven is typically something like:
+      # ./mvnw validate process-resources -am -Pantora-process-resources
+      command: gradlew -q "-Dorg.gradle.jvmargs=-Xmx3g -XX:+HeapDumpOnOutOfMemoryError" :spring-shell-docs:generateAntoraYml
+      local: true
+    scan:
+      # FIXME Change "dir" to the location that generated files are at
+      # See https://gitlab.com/antora/antora-collector-extension/-/blob/main/docs/modules/ROOT/pages/configuration-keys.adoc?ref_type=heads#collector-reference
+      # HINT: Maven is typically something like:
+      # target/classes/antora-resources/
+      dir: ./build/generated-antora-resources
+
+asciidoc:
+  attributes:
+    attribute-missing: 'warn'
+    chomp: 'all'