gif

convert -size 1080x1080 -delay 20 -dispose previous -loop 0 -layers Optimize -transparent *.png 006.000.gif

Reference:

https://imagemagick.org/script/command-line-options.php#background

https://webinista.com/updates/how-to-create-animated-gifs-imagemagick/

http://shebangthedolphins.net/gnulinux_ultimate_gif_tutorial.html