Make magick cmd available across CI envs

.github/workflows/appimage-build.yml

@@ -38,6 +38,10 @@ jobs:
             perl python3 python3-minimal python3-dev python3-cffi mono-devel desktop-file-utils \
             fonts-noto-color-emoji breeze-gtk-theme \
             patchelf file curl imagemagick
+          if ! command -v magick >/dev/null 2>&1 && command -v convert >/dev/null 2>&1; then
+            printf '%s\n' '#!/bin/sh' 'exec convert "$@"' | sudo tee /usr/local/bin/magick >/dev/null
+            sudo chmod +x /usr/local/bin/magick
+          fi
 
       - name: Configure
         run: |