ci: install nodejs from Debian repositories

This source should be more reproducable, than the deb package
repositories from nodesource.com.
In addition we avoid sourcing a shell script from an untrusted location.

.gitlab-ci.yml

@@ -24,10 +24,8 @@ cache:
 bundle_and_test:
   stage: bundle
   before_script:
-    - apt-get update
-    - apt-get install -y curl
-    - curl -sL https://deb.nodesource.com/setup_10.x | bash -
-    - apt-get install -y nodejs
+    - apt-get --quiet update
+    - apt-get --quiet --yes install nodejs
     - npm install -g @apidevtools/swagger-cli
 
   script:
@@ -51,10 +49,8 @@ bundle_and_test:
 pages:
   stage: deploy
   before_script:
-    - apt-get update
-    - apt-get install -y curl
-    - curl -sL https://deb.nodesource.com/setup_10.x | bash -
-    - apt-get install -y nodejs
+    - apt-get --quiet update
+    - apt-get --quiet --yes install nodejs
     - npm install swagger-ui-dist@3.22.1
   script:
     - cp -rp node_modules/swagger-ui-dist/* ./public