[Regression] - Fixing Docker setup regression in yarn install comma…

…nd (oppia#19054)

* mathjs issue

* checking for pure-lockfile flag

* checking for pure-lockfile flag

* fixing mathjs issue

Makefile

@@ -80,7 +80,7 @@ update.package: ## Installs the npm requirements for the project
 # TODO(#18260): Permanently change the yarn configurations in `.yarnrc` when permanently moving to Docker Setup.
 # Creating a .yarnrc file to use yarn under docker
 	@echo 'cache-folder "/root/.yarn-cache"' > .yarnrc
-	${SHELL_PREFIX} angular-build yarn install
+	${SHELL_PREFIX} angular-build yarn install --pure-lockfile
 # Reverting the .yarnrc file to the original state, so that it works in python setup also.
 	@echo 'yarn-path "../oppia_tools/yarn-1.22.15/bin/yarn"' > .yarnrc
 	@echo 'cache-folder "../yarn_cache"' >> .yarnrc

docker/Dockerfile.frontend

@@ -11,5 +11,6 @@ RUN apt-get update -y && apt-get upgrade -y \
 COPY package.json .
 COPY scripts/linters/custom_eslint_checks ./scripts/linters/custom_eslint_checks
 
+COPY yarn.lock .
 RUN npm install -g [email protected] --force
-RUN yarn install
+RUN yarn install --pure-lockfile