Ensure pnpm workspace file is available in viewer image

frontend/Dockerfile

@@ -2,6 +2,7 @@
 # TODO: can't use vanilla alpine version since python is needed for gql-codegen stuff.
 FROM node:20 AS builder-base
 WORKDIR /app
+COPY . /app/
 RUN corepack enable
 
 FROM builder-base AS builder-viewer
@@ -17,7 +18,6 @@ FROM builder-base AS builder
 COPY package.json pnpm-lock.yaml /app/
 RUN --mount=type=cache,target=/root/.local/share/pnpm/store pnpm install
 
-COPY . /app/
 COPY src /app/src
 COPY static /app/static
 COPY --from=builder-viewer /app/viewer/dist-web-component /app/viewer/dist-web-component