software/theia: fix build error when git is not in $PATH

because python-language-server-requirements.txt contains a git URL

software/theia/software.cfg

@@ -38,7 +38,7 @@ md5sum = 4a02e1687a150113ad6b0215f9afdb3e
 version = 0.19.0
 recipe = plone.recipe.command
 command =
-  bash -c "${python3:executable} -m venv ${:location} && \
+  PATH=${git:location}/bin/:$PATH  bash -c "${python3:executable} -m venv ${:location} && \
     . ${:location}/bin/activate && \
     pip install -r ${python-language-server-requirements.txt:output}"
 location = ${buildout:parts-directory}/${:_buildout_section_name_}