replace apt-get with apk add of Alpine

.gitlab-ci.yml

@@ -21,7 +21,7 @@ default:
   before_script:
     - apk add --update --no-cache git go
     - git submodule update --init --recursive
-    - apt-get update && apt-get install Node.js
+    - apk add --update npm
     - npm create hyas@latest -- --template doks
     - hugo mod init gitlab.com/pages/hugo
     - hugo mod get -u github.com/gethyas/doks