migrate installation to volta install too

.gitlab-ci.yml

@@ -3,15 +3,11 @@ image: node:latest
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
 
-build:
-  script:
-    - npm install
-  artifacts:
-    paths:
-      - node_modules/
-
 test:
   before_script:
+    - apt-get update -qq && apt-get install -y -qq curl
+    - curl https://get.volta.sh | bash
+    - npm install
     - apt-get update -qq && apt-get install -y -qq hugo
   script:
     - hugo
@@ -21,6 +17,9 @@ test:
 
 pages:
   before_script:
+    - apt-get update -qq && apt-get install -y -qq curl
+    - curl https://get.volta.sh | bash
+    - npm install
     - apt-get update -qq && apt-get install -y -qq hugo
   script:
     - hugo