Add 'trigger-docs-build' workflow

.github/workflows/trigger-docs-build.yml

@@ -0,0 +1,25 @@
+name: Trigger Docs Build
+on:
+  workflow_dispatch:
+    inputs:
+      build-refname:
+        description: Enter git refname to build (e.g., 1.0.x).
+        required: false
+      build-version:
+        description: Enter the version being build (e.g. 1.0.3-SNAPSHOT)
+        required: false  
+permissions:
+  actions: write
+jobs:
+  build:
+    if: github.repository_owner == 'spring-projects'
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check Out
+      uses: actions/checkout@v4
+      with:
+        ref: docs-build
+    - name: Trigger Workflow
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: gh workflow run deploy-docs.yml -r docs-build -f build-refname=${{ github.event.inputs.build-refname }} -f build-version=${{ github.event.inputs.build-version }}