fix(remix-ui): install correct pnpm version

This patch ensures that we still take advantage of the layer caching
that only relies on the `pnpm-lock.yaml` file and not the `package.json`
file (which could change due to added scripts, etc). Previously, there
was an issue with the default `pnpm` version not being compatible with
the `pnpm` version specified by our `package.json`. I now explicitly
install the same version with `corepack` before the `pnpm fetch` step.

Alternatively, I should probably just update the `pnpm` version used by
the project to match what is used in the Node.js 22 Docker image by
default.

Ref: https://pnpm.io/cli/fetch

Fixes: 49e0ac2 ("fix: reckless change for docker build")

remix-ui/Dockerfile

@@ -1,6 +1,8 @@
 # base node image
 FROM node:22-bullseye-slim as base
-RUN corepack enable
+
+RUN corepack enable pnpm && corepack install -g pnpm@8.10.5
+
 WORKDIR /site
 
 # set for base and all layer that inherit from it
@@ -17,7 +19,7 @@ ADD pnpm-lock.yaml .
 RUN pnpm fetch
 
 ADD package.json .
-RUN pnpm install
+RUN pnpm install --frozen-lockfile --offline
 
 # build the app
 ADD . .