Install Python3.9 before running the CI script

jkawamoto · jkawamoto · commit 8f5abde896ef · 2022-08-11T02:43:31.000-06:00
diff --git a/.build.yml b/.build.yml
@@ -2,6 +2,7 @@ image: archlinux
 packages:
   - python
   - python-pip
+  - python39
 sources:
   - https://github.com/kragniz/python-etcd3
 environment:
