fix(fm-test-services): Use lockfile in docker test

ufm-test-services/metamask/Dockerfile

@@ -7,15 +7,17 @@ WORKDIR /app
 # Update PATH
 ENV PATH /app/node_modules/.bin:$PATH
 
+RUN npm i -g pnpm
+
 RUN if [ "$METAMASK_PLAYWRIGHT_RUN_HEADLESS" != "false" ]; then \
         apt-get update && \
         apt-get install -y xvfb && \
         rm -rf /var/lib/apt/lists/* ; \
     fi
 
 # Copy necessary files and directories
-COPY package.json /app/
-RUN npm install
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml /app/
+RUN pnpm install --frozen-lockfile
 COPY tests /app/tests/
 COPY playwright.config.ts /app/
 COPY start.sh /app/