Docker: Fix root docker file build (#23772)

Fixes #23754

Dockerfile

@@ -25,7 +25,7 @@ COPY packages packages
 
 RUN yarn install --pure-lockfile --no-progress
 
-COPY Gruntfile.js tsconfig.json .eslintrc .editorconfig .browserslistrc ./
+COPY Gruntfile.js tsconfig.json .eslintrc .editorconfig .browserslistrc .prettierrc.js ./
 COPY public public
 COPY scripts scripts
 COPY emails emails