Render release-note planning previews

.github/workflows/release-notes-preview.yaml

@@ -106,6 +106,7 @@ jobs:
           token: ${{ secrets.DOCS_CI_RO_PAT || secrets.docs_ci_ro_pat }}
           sparse-checkout: |
             releases
+            previews
           sparse-checkout-cone-mode: true
 
       - name: Select changed release directories
@@ -115,14 +116,17 @@ jobs:
           set -euo pipefail
           git -C site/_source/release-notes fetch --depth=1 origin main
           git -C site/_source/release-notes diff --name-only --diff-filter=ACMRT \
-            FETCH_HEAD HEAD -- releases \
-            | awk -F/ 'NF >= 4 { print $1 "/" $2 "/" $3 }' \
+            FETCH_HEAD HEAD -- releases previews \
+            | awk -F/ '
+                $1 == "releases" && NF >= 4 { print $1 "/" $2 "/" $3 }
+                $1 == "previews" && NF >= 3 { print $1 "/" $2 }
+              ' \
             | sort -u > .release-preview-targets
           if [[ ! -s .release-preview-targets ]]; then
-            echo "No changed release directories found"
+            echo "No changed release or preview directories found"
             exit 1
           fi
-          echo "Targeted release directories:"
+          echo "Targeted release and preview directories:"
           cat .release-preview-targets
 
       - name: Verify copyright headers
@@ -139,6 +143,9 @@ jobs:
       - name: Populate release notes
         run: |
           cp -r site/_source/release-notes/releases site
+          if [[ -d site/_source/release-notes/previews ]]; then
+            cp -r site/_source/release-notes/previews site
+          fi
           rm -f site/releases/backend-releases.qmd site/releases/cmvm-releases.qmd
 
       - name: Configure AWS credentials