/usr/share/geany/templates/files/ is in geany-common 1.29-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/geany/templates/files/file.html
/usr/share/geany/templates/files/file.php
/usr/share/geany/templates/files/file.rb
/usr/share/geany/templates/files/file.tex
/usr/share/geany/templates/files/file_html5.html
/usr/share/geany/templates/files/main.c
/usr/share/geany/templates/files/main.cxx
/usr/share/geany/templates/files/main.d
/usr/share/geany/templates/files/main.java
/usr/share/geany/templates/files/main.py
/usr/share/geany/templates/files/main.vala
/usr/share/geany/templates/files/module.erl
/usr/share/geany/templates/files/program.pas