Disable mandb updates for action

action.yml

@@ -24,7 +24,37 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: cvmfs-contrib/github-action-cvmfs@f93ba85417fc145df0f82c672618dc7dd94c1702  # v5.2 + cache name update
+    - id: disable-mandb
+      run: |
+        # Detect macOS (Darwin) and exit safely
+        if [ "$(uname)" = "Darwin" ]; then
+          echo "🛑 Skipping man-db disable: not applicable on macOS."
+          exit 0
+        fi
+        # Proceed only if we're on a Debian/Ubuntu-like Linux
+        if [ ! -x /usr/bin/dpkg ]; then
+          echo "⚠️  dpkg not found — this system doesn't use man-db triggers."
+          exit 0
+        fi
+        # Disable man-db updates (safe even if man-db is not installed)
+        # 1. Ensure the directory for custom binaries exists
+        sudo mkdir -p /usr/local/sbin
+        # 2. If mandb exists, back it up once
+        if [ -x /usr/bin/mandb ] && [ ! -f /usr/bin/mandb.disabled ]; then
+          sudo mv /usr/bin/mandb /usr/bin/mandb.disabled
+        fi
+        # 3. Replace mandb with a dummy command that does nothing but succeed
+        if [ ! -e /usr/local/sbin/mandb ]; then
+          echo -e '#!/bin/sh\nexit 0' | sudo tee /usr/local/sbin/mandb >/dev/null
+          sudo chmod +x /usr/local/sbin/mandb
+        fi
+        # 4. (Optional) Remove man-db’s post-install trigger script if it exists
+        if [ -f /var/lib/dpkg/info/man-db.postinst ]; then
+          sudo rm -f /var/lib/dpkg/info/man-db.postinst
+        fi
+      shell: bash
+    - id: install-cvmfs
+      uses: cvmfs-contrib/github-action-cvmfs@f93ba85417fc145df0f82c672618dc7dd94c1702  # v5.2 + cache name update
       with:
         # Can't use config package for macOS but our repos are available with the default configuration anyway
         # cvmfs_config_package: https://github.com/EESSI/filesystem-layer/releases/download/latest/cvmfs-config-eessi_latest_all.deb