Polish update-antora-ui-spring action

Improved README by adding an example when branches have a different antora file path
Fixed an error where the checkout step did not clone the right branch

README.adoc

@@ -121,16 +121,22 @@ permissions:
 jobs:
   update-antora-ui-spring:
     runs-on: ubuntu-latest
-    name: Update Antora UI Spring
+    name: Update
     strategy:
       matrix:
-        branch: ['main', 'docs-build']
+        branch: [ '5.8.x', '6.1.x', '6.2.x', 'main' ]
     steps:
-      - uses: spring-io/spring-docs-actions/update-antora-spring-ui@{ACTION_VERSION}
-        name: Update antora-playbook.yml
+      - uses: spring-io/spring-doc-actions/update-antora-spring-ui@{ACTION_VERSION}
+        name: Update on Supported Branches
         with:
           docs-branch: ${{ matrix.branch }}
           token: ${{ secrets.GITHUB_TOKEN }}
+          antora-file-path: 'docs/antora-playbook.yml'
+      - uses: spring-io/spring-doc-actions/update-antora-spring-ui@{ACTION_VERSION}
+        name: Update on docs-build
+        with:
+          docs-branch: 'docs-build'
+          token: ${{ secrets.GITHUB_TOKEN }}
 ----
 
 The PR will only be created if there is no open PR for the same branch, even if there is a newer version of Antora UI Spring.

update-antora-spring-ui/action.yml

@@ -19,6 +19,8 @@ runs:
   using: "composite"
   steps:
     - uses: actions/checkout@v4
+      with:
+        ref: ${{ inputs.docs-branch }}
     - id: generate-branch-name
       name: Generate Branch Name
       run: echo "branch-name=${{ inputs.docs-branch }}_${{ inputs.workflow-branch-suffix }}" >> $GITHUB_OUTPUT