[PATCH v2 2/2] pre-inst-env.in: Export GUIX_EXTENSIONS_PATH

[Olivier Dion]

This can be useful for testing examples while developing.

`./pre-inst-env guix workflow run ./doc/examples/example-workflow.w`
---
 pre-inst-env.in | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pre-inst-env.in b/pre-inst-env.in
index fcb4460..e447e30 100644
--- a/pre-inst-env.in
+++ b/pre-inst-env.in
@@ -30,4 +30,7 @@ export PATH
 GWL_UNINSTALLED="t"
 export GWL_UNINSTALLED
 
+GUIX_EXTENSIONS_PATH="$abs_top_builddir/guix/extensions"
+export GUIX_EXTENSIONS_PATH
+
 exec "$@"
-- 
2.35.1