fix(deploy): export missing slug variable to fix branch preview directory generation

.gitea/workflows/deploy.yml

@@ -37,6 +37,8 @@ jobs:
       next_public_url:  ${{ steps.determine.outputs.next_public_url }}
       project_name:     ${{ steps.determine.outputs.project_name }}
       short_sha:        ${{ steps.determine.outputs.short_sha }}
+      slug:             ${{ steps.determine.outputs.slug }}
+      gatekeeper_host:  ${{ steps.determine.outputs.gatekeeper_host }}
     container:
       image: catthehacker/ubuntu:act-latest
     steps:
@@ -113,6 +115,7 @@ jobs:
               echo "project_name=$PRJ-$TARGET"
             fi
             echo "short_sha=$SHORT_SHA"
+            echo "slug=$SLUG"
           } >> "$GITHUB_OUTPUT"
 
           # ⏳ Wait for Upstream Packages/Images if Tagged
@@ -251,6 +254,7 @@ jobs:
       NEXT_PUBLIC_BASE_URL: ${{ needs.prepare.outputs.next_public_url }}
       TRAEFIK_HOST:         ${{ needs.prepare.outputs.traefik_host }}
       GATEKEEPER_HOST:      ${{ needs.prepare.outputs.gatekeeper_host }}
+      SLUG:                 ${{ needs.prepare.outputs.slug }}
       
       # Secrets mapping (Payload CMS)
       PAYLOAD_SECRET:          ${{ secrets.PAYLOAD_SECRET || vars.PAYLOAD_SECRET || 'you-need-to-set-a-payload-secret' }}