archive-font-patcher: Write commit hash instead of tags in readme

[why]
In the CI we have only a shallow clone of the repo, so access to tags is
not possible. Instead of resulting in a nice message like '2.3.3-35' we
get an empty string.

[how]
As we have no tags we can only write the commit hash and other
information given in the only existing (i.e. last) commit:
date, author, title

It's a bit more cumbersome but one can still see from which point in the
repo the archive has been created.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

bin/scripts/archive-font-patcher.sh

@@ -19,8 +19,8 @@ mini_readme="$outputdir/readme.md"
 cat "$parent_dir/src/archive-font-patcher-readme.md" >> "$mini_readme"
 if [ $# -ge 1 ]; then
   echo "Intemediate version, adding git version"
-  echo -e "\n## Version\n" >> "$mini_readme"
-  echo "This archive is created from $(git describe --tags --dirty)" >> "$mini_readme"
+  echo -e "\n## Version\nThis archive is created from\n" >> "$mini_readme"
+  git log --pretty=medium --no-decorate --no-abbrev -n 1 HEAD | sed 's/^/        /' >> "$mini_readme"
 fi
 
 # clear out the directory zips