Fix app path in build-chart-paperless-ngx.yml

Updated the APP environment variable in the Helm package job from
'charts/pperless-ngx' to 'charts/paperless-ngx'. This change was
necessary to correct the path to the Paperless NGX chart, ensuring
that the workflow refers to the correct directory. The previous path
contained a typo which would have resulted in build errors. There are
no breaking changes introduced with this update.

.gitea/workflows/build-chart-paperless-ngx.yml

@@ -10,7 +10,7 @@ jobs:
   helm-package:
     runs-on: ubuntu-latest
     env:
-      APP: charts/pperless-ngx
+      APP: charts/paperless-ngx
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3