[gtk-web] ci: Add python2

[Emmanuele Bassi <ebassi src gnome org>]

commit 0de647cd8e5c63ffa6ad63cefdb93c80f15204e0
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Aug 19 18:10:51 2021 +0100

    ci: Add python2
    
    Apparently, the ruby:2.7 image dropped python2 and now we have to
    manually install it.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3335034..62b29df 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,7 +6,7 @@ variables:
 
 before_script:
   - apt-get update -y
-  - apt-get install -y curl rsync
+  - apt-get install -y curl rsync python2
   - curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.36.0/install.sh | bash
   - source /root/.bashrc
   - nvm install 15.9.0