- switch to lts-19.12 (GHC 9.0.2)
- use cabal v2 commands, which build locally by default and don't
need a separate sandbox
- update SEL4.cabal file to cabal spec version 3
- remove generated `cabal.project.local~*` backup files after configure
to avoid flooding the directory
Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>
The PDF has been out of date for a while and is unmaintained. For now,
we leave the file format as literate Haskell, but retire the build for
the PDF document.
JIRA VER-912
Gerwin Klein
Gerwin Klein
Alejandro Gomez-Londono
Matthew Brecknell
Japheth Lim