ci: still need `l3build unpack`

step version: v0.9

step version: v0.8

step version: v0.7e

step version: v0.7d

step version: v0.7c

step version: v0.7b

test: add local variables in build.lua

step version: v0.7

step version: v0.6

- Since TeX will automatically add `.tex` to the latexmkrc files, I name them `*.cfg` first then use a shell script to rename afterwards.
- `fduthesis-en.ltx` -> `fduthesis-en.tex`.
- Add `make-tds.sh`.
- Now `get-doc-en.lua` can capture arguments from shell.