[gtk-web/ebassi/ci-tests] ci: Pin node to 15.9.0

[Emmanuele Bassi <ebassi src gnome org>]

commit ecccac8b7b669e9f02a7121b16e6825f343ccf40
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed May 5 21:54:13 2021 +0100

    ci: Pin node to 15.9.0
    
    Newer versions of Node break node-sass.

 .gitlab-ci.yml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a1215a9..3335034 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,10 +7,10 @@ variables:
 before_script:
   - apt-get update -y
   - apt-get install -y curl rsync
-  - curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.0/install.sh | bash
+  - curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.36.0/install.sh | bash
   - source /root/.bashrc
-  - nvm install node
-  - nvm use node
+  - nvm install 15.9.0
+  - nvm use 15.9.0
   - chmod +x setup.sh && bash setup.sh
 
 test: