Revert "Don't run postinstall script separately from yarn install" (#634)

This reverts commit 2c7c63e.

See the following comment for a full description
#629 (comment)

Author: michalinacienciala

monitoring/Dockerfile

@@ -24,7 +24,8 @@ COPY package.json yarn.lock ./
 COPY tsconfig.json ./
 COPY src ./src
 
-RUN yarn install --frozen-lockfile
+RUN yarn install --frozen-lockfile --ignore-scripts
+RUN yarn run postinstall
 
 RUN yarn build