Record commit checksum in log files

[vatai]

I guess the most straight forward way to do this is to rename the log files to include the checksum.

• We can/should do this for *.log files.
• We should copy (so it is not destructive).
• We should check if it is a clean git working directory (otherwise the log does not have to represent the commit's "output").

The ingredients: How to check if the directory working directory is clean: https://unix.stackexchange.com/questions/155046/determine-if-git-working-directory-is-clean-from-a-script

To get the (short) checksum: git log -1 --oneline | cut -c-7

[vatai]

Maybe also make a *.log_latest copy and compare the test_builds.sh generated logs with the "latest correct" log files.