zimwriterfs 1.2-1build4 (arm64 binary) in ubuntu focal

 zimwriterfs is a console tool to create ZIM files from a locally-stored
 directory containing "self-sufficient" HTML content (with pictures,
 javascript, and stylesheets). The result will contain all the files of the
 local directory compressed and merged in the ZIM file. Nothing more, nothing
 less. The generated file can be opened with a ZIM reader; Kiwix is one
 example, but there are others.