Bootstrap inline shared workflow (only needed for docs-builder repo)

.github/actions/bootstrap/action.yml

@@ -13,7 +13,7 @@ outputs:
 runs:
   using: "composite"
   steps:
-    # Ensure we fetch all tags
+    # ensure we fetch all tags
     - shell: bash
       run: |
         git fetch --prune --unshallow --tags

.github/workflows/preview-build.yml

@@ -74,12 +74,6 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.ref }}
           persist-credentials: false
 
-      - name: Free Disk Space
-        if: contains(fromJSON('["elastic/security-docs"]'), github.repository)
-        uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # v1.3.1
-        with:
-          tool-cache: false
-
       - name: Create Deployment
         if: contains(fromJSON('["push", "workflow_dispatch"]'), github.event_name) || (steps.check-files.outputs.any_modified == 'true' && startsWith(github.event_name, 'pull_request'))
         uses: actions/github-script@v7
@@ -136,11 +130,28 @@ jobs:
               ;;
           esac
 
-      - name: Bootstrap Action Workspace
+      - name: 'Bootstrap docs-builder repo only: git'
+        shell: bash
+        if: github.repository == 'elastic/docs-builder' && steps.deployment.outputs.result
+        run: |
+          git fetch --prune --unshallow --tags
+          git tag --list
+
+      - name: 'Bootstrap docs-builder repo only: dotnet'
+        uses: actions/setup-dotnet@v4
         if: github.repository == 'elastic/docs-builder' && steps.deployment.outputs.result
-        uses: elastic/docs-builder/actions/bootstrap@main
+        with:
+          global-json-file: global.json
+
+      - name: 'Bootstrap docs-builder repo only: npm'
+        uses: actions/setup-node@v4
+        if: github.repository == 'elastic/docs-builder' && steps.deployment.outputs.result
+        with:
+          cache: npm
+          cache-dependency-path: src/Elastic.Markdown/package-lock.json
+          node-version-file: .nvmrc
 
-      # we run our artifact directly please use the prebuild
+          # we run our artifact directly please use the prebuild
       # elastic/docs-builder@main GitHub Action for all other repositories!
       - name: Build documentation
         if: github.repository == 'elastic/docs-builder' && steps.deployment.outputs.result