DEVPROD-787: Retry Node installation on CI (#498)

.evergreen.yml

@@ -227,14 +227,22 @@ functions:
         shell: bash
         script: |
           ${PREPARE_SHELL}
+
           # Fetch NVM and install it into this task's .nvm directory
           # Once downloaded, source nvm and install yarn
           git clone https://github.com/nvm-sh/nvm.git "$NVM_DIR"
           cd "$NVM_DIR"
           git checkout `git describe --abbrev=0 --tags --match "v[0-9]*" $(git rev-list --tags --max-count=1)`
           [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
           cd -
-          nvm install --no-progress --default ${node_version}
+          
+          # Retry the download for Node in case it flakes.
+          for i in {1..5}; do
+            nvm install --no-progress --default ${node_version}
+            [[ $? -eq 0 ]] && break
+            echo "Attempt $i of 5 to install Node failed"
+            sleep 10
+          done
           npm install -g yarn
 
   sym-link: