Merge pull request #12612 from Pestdoktor/docker-cleanup

docker: optimize custom sdk builds

scripts/docker-link-repos.sh

@@ -20,17 +20,15 @@ then
 fi
 
 echo "Linking js-sdk"
-git clone $JS_SDK_REPO js-sdk
+git clone --depth 1 --branch $JS_SDK_BRANCH $JS_SDK_REPO js-sdk
 cd js-sdk
-git checkout $JS_SDK_BRANCH
 yarn link
 yarn --network-timeout=100000 install
 cd ../
 
 echo "Linking react-sdk"
-git clone $REACT_SDK_REPO react-sdk
+git clone --depth 1 --branch $REACT_SDK_BRANCH $REACT_SDK_REPO react-sdk
 cd react-sdk
-git checkout $REACT_SDK_BRANCH
 yarn link
 yarn link matrix-js-sdk
 yarn --network-timeout=100000 install