CI-unixish.yml: uninstall man-db package on ubuntu to avoid potential stalls in package installations

Author: firewave

.github/workflows/CI-unixish.yml

@@ -29,6 +29,14 @@ jobs:
       with:
         persist-credentials: false
 
+    # the man-db trigger causes package installations to stall for several minutes at times. so just drop the package.
+    # see https://github.com/actions/runner/issues/4030
+    - name: Remove man-db on ubuntu
+      if: contains(matrix.os, 'ubuntu')
+      run: |
+        sudo apt-get update
+        sudo apt-get remove man-db
+
     - name: Install missing software on ubuntu
       if: matrix.os == 'ubuntu-24.04'
       run: |