ci: fix preview pipeline

fix publish preview to get github pages functional again

Signed-off-by: Jasper Berton <jasper.berton@team.blue>

Author: JasperB-TeamBlue

.github/workflows/preview.yml

@@ -152,8 +152,8 @@ jobs:
         run: |
           commit=$(git log --format="%H" -n 1)
           description=$(git describe --always)
-          if git status --porcelain 2>/dev/null| grep -E "^??|^M"
-          then
+          git add -A
+          if ! git diff --cached --quiet; then
             git add .
             git commit -m "gh-pages ${description} ${commit}"
             git push