Increase timeout for yarn install in Docker builds

Otherwise we run into problems where Docker Hub's limited machines timeout trying to download our dependencies

scripts/docker-link-repos.sh

@@ -13,7 +13,7 @@ git clone $JS_SDK_REPO js-sdk
 cd js-sdk
 git checkout $JS_SDK_BRANCH
 yarn link
-yarn install
+yarn --network-timeout=100000 install
 cd ../
 
 echo "Linking react-sdk"
@@ -22,7 +22,7 @@ cd react-sdk
 git checkout $REACT_SDK_BRANCH
 yarn link
 yarn link matrix-js-sdk
-yarn install
+yarn --network-timeout=100000 install
 cd ../
 
 echo "Setting up riot-web with react-sdk and js-sdk packages"