fix: setting workdir in order to get app folder created (#701)

* fix: setting workdir in order to get app folder created

The app folder could also be simply created, but it's better aligned with best practises anyway to set the workdir.

* fix: removed incorrectly placed workdir

Author: simonhyll

versioned_docs/version-9.x/docker.md

@@ -142,6 +142,7 @@ So an alternative is to use a typical Dockerfile with layers that are built incr
 
 ```dockerfile title="Dockerfile"
 FROM node:20-slim AS base
+WORKDIR /app
 
 ENV PNPM_HOME="/pnpm"
 ENV PATH="$PNPM_HOME:$PATH"
@@ -150,7 +151,6 @@ RUN corepack enable
 FROM base AS prod
 
 COPY pnpm-lock.yaml /app
-WORKDIR /app
 RUN pnpm fetch --prod
 
 COPY . /app