use python 3.10 for FAI

Bug: n/a
Test: will be tested in kokoro
Change-Id: Id78725c967ffd35a791b5a4ea6fbad86fe9ddfba
diff --git a/build/debian/kokoro/gcp_ubuntu_docker/build.sh b/build/debian/kokoro/gcp_ubuntu_docker/build.sh
index fb2a1a3..88ce921 100644
--- a/build/debian/kokoro/gcp_ubuntu_docker/build.sh
+++ b/build/debian/kokoro/gcp_ubuntu_docker/build.sh
@@ -3,5 +3,11 @@
 set -e
 
 cd "${KOKORO_ARTIFACTS_DIR}/git/avf/build/debian/"
+
+# FAI needs it
+pyenv install 3.10
+pyenv global 3.10
+python --version
+
 sudo losetup -D
 sudo ./build.sh