add 18.20 node installation to buildLinux

Author: bobbyu99

shared-scripts.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+AMPLIFY_NODE_VERSION=18.20.4
+
 # set exit on error to true
 set -e
 
@@ -131,6 +133,7 @@ function _setShell {
 
 function _buildLinux {
   _setShell
+  _setupNodeVersion $AMPLIFY_NODE_VERSION
   echo "Linux Build"
   yarn run production-build
   storeCacheForLinuxBuildJob
@@ -512,4 +515,25 @@ function _emitRegionalizedCanaryMetric {
     --value $CODEBUILD_BUILD_SUCCEEDING \
     --dimensions branch=release,region=$CLI_REGION \
     --region us-west-2
+}
+
+function _setupNodeVersion {
+  local version=$1  # Version number passed as an argument
+  
+  echo "Installing NVM and setting Node.js version to $version"
+  
+  # Install NVM
+  curl -o - https://raw.githubusercontent.com/nvm-sh/nvm/master/install.sh | bash
+  
+  # Load NVM
+  export NVM_DIR="$HOME/.nvm"
+  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+  
+  # Install and use the specified Node.js version
+  nvm install "$version"
+  nvm use "$version"
+  
+  # Verify the Node.js version in use
+  echo "Node.js version in use:"
+  node -v
 }