diff --git a/.gitea/workflows/generate-iso.yaml b/.gitea/workflows/generate-iso.yaml
index be3136f..75de639 100644
--- a/.gitea/workflows/generate-iso.yaml
+++ b/.gitea/workflows/generate-iso.yaml
@@ -95,12 +95,13 @@ jobs:
         run: |
           ### GPG-Home relative to the Runner Workspace to avoid changing global files.
           export GNUPGHOME="$(pwd)/.gnupg"
-          mkdir -m700 "${GNUPGHOME}"
+          mkdir -m 700 "${GNUPGHOME}"
           echo "${{ secrets.PGP_MSW_DEPLOY_CORESECRET_DEV }}" >| ci-bot.sec.asc
           gpg --batch --import ci-bot.sec.asc
           ### Trust the key automatically
           KEY_ID=$(gpg --list-keys --with-colons | awk -F: '/^pub:/ {print $5}')
           echo "trust-model always" >| "${GNUPGHOME}/gpg.conf"
+        shell: bash
 
       - name: Configuring Git for signed CI/DEPLOY commits.
         run: |