Updated to use pnpm

Now enforcing use of node 17 (not using 18 due to dep. issue)

Signed-off-by: Louis Hollingworth <louis@hollingworth.ch>

Dockerfile

@@ -1,5 +1,5 @@
 # Dockerfile
-FROM node:18-alpine
+FROM node:17-alpine
 
 # create destination directory
 RUN mkdir -p /usr/src/nuxt-app