* Add simple Debian package
* Update CI configuration
* Add cpack Deb package for libggwave-dev
* Add `make deb` top level target and CI job
* Ensure `make deb` packages are deterministic
Update CMakeLists.txt to make cpack generated Debian packages
deterministic build outputs by:
- Setting SOURCE_DATE_EPOCH to 0
- Executing `git log -1 --pretty=%ct` and storing the result in
SOURCE_DATE_EPOCH, overriding 0
- Export SOURCE_DATE_EPOCH to the environment
- Explicitly prefix the execution of the cpack command in the custom
target `deb_c_library` with SOURCE_DATE_EPOCH
Update `README.md-tmpl.md` and `README.md` to document new `make deb`
target.
The Makefile for the Python bindings already handle deterministic
building with the same strategy.
* libc6, not libc
