Procedure to add an icon to the spacewalk font

• have a designer produce a black-on-transparent SVG or draw it yourself
• go to https://icomoon.io/app
• remove all existing icon sets
• click on Import Icons
• upload https://github.com/uyuni-project/uyuni/blob/master/web/html/src/branding/fonts/font-spacewalk/font/spacewalk-icon.svg (this is a special SVG file containing all current icons and code points, it is not editable with Inkscape or other standard editors)
• upload the new SVG file by dragging it into icomoon's app window
• move it to the end of the spacewalk-icon set using Ctrl+Shift+mouse drag
• select all icons
• click on Generate Font at the bottom of the page
• set a new sequential code point for the newly added icon (note that code points are specified in hexadecimal)
• save and export the new version of spacewalk-icon files (that will be svg, eot, ttf and woff in a zipfile)
• commit all files in https://github.com/uyuni-project/uyuni/blob/master/web/html/src/branding/fonts/font-spacewalk/font
• edit https://github.com/uyuni-project/uyuni/blob/master/web/html/src/branding/fonts/font-spacewalk/css/spacewalk-font.css to add a CSS class for the newly added code point and commit it