backend,yarnrc: bring yarn network-timeout down to 300s

.changeset/beige-queens-crash.md

@@ -9,5 +9,5 @@ To apply these changes to an existing app, make the following changes to `packag
 Replace the `RUN yarn install ...` line with the following:
 
 ```bash
-RUN yarn install --frozen-lockfile --production --network-timeout 600000 && rm -rf "$(yarn cache dir)"
+RUN yarn install --frozen-lockfile --production --network-timeout 300000 && rm -rf "$(yarn cache dir)"
 ```

.yarnrc

@@ -6,4 +6,4 @@ registry "https://registry.npmjs.org/"
 disable-self-update-check true
 lastUpdateCheck 1580389148099
 yarn-path ".yarn/releases/yarn-1.22.1.js"
-network-timeout 600000
+network-timeout 300000

packages/backend/Dockerfile

@@ -7,7 +7,7 @@ WORKDIR /usr/src/app
 # and along with yarn.lock and the root package.json, that's enough to run yarn install.
 ADD yarn.lock package.json skeleton.tar ./
 
-RUN yarn install --frozen-lockfile --production --network-timeout 600000 && rm -rf "$(yarn cache dir)"
+RUN yarn install --frozen-lockfile --production --network-timeout 300000 && rm -rf "$(yarn cache dir)"
 
 # This will copy the contents of the dist-workspace when running the build-image command.
 # Do not use this Dockerfile outside of that command, as it will copy in the source code instead.

packages/create-app/templates/default-app/packages/backend/Dockerfile

@@ -7,7 +7,7 @@ WORKDIR /usr/src/app
 # and along with yarn.lock and the root package.json, that's enough to run yarn install.
 ADD yarn.lock package.json skeleton.tar ./
 
-RUN yarn install --frozen-lockfile --production --network-timeout 600000 && rm -rf "$(yarn cache dir)"
+RUN yarn install --frozen-lockfile --production --network-timeout 300000 && rm -rf "$(yarn cache dir)"
 
 # This will copy the contents of the dist-workspace when running the build-image command.
 # Do not use this Dockerfile outside of that command, as it will copy in the source code instead.