Dot files are included in release archives

[mwest1066]

We have a rule in CMakeLists to ignore files that start with .:

partmc/CMakeLists.txt

Line 29 in 2aed8ca

set(CPACK_SOURCE_IGNORE_FILES "${CPACK_SOURCE_IGNORE_FILES};/.*~$;/[.].*/;/build/;/figures/;/scenarios/[^123456].*/;/doc/condensation/;/doc/deposition/;/doc/ship_track/;/old/;/tool/;/TODO;/CMakeCache.txt")

This seems to be failing because the 2.6.1 archive has dot-files (e.g., .gitignore, .dockerignore) in it.