fix: feature flag node corepack usage (#860)

* fix: feature flag node corepack usage

* chore: PR feedback

run-build-functions.sh

@@ -133,9 +133,10 @@ restore_node_modules() {
 
 run_yarn() {
   yarn_version=$1
+  featureFlags=$2
   restore_home_cache ".yarn_cache" "yarn cache"
 
-  if ! [ $(which corepack) ]; then
+  if ! [ $(which corepack) ] || has_feature_flag "$featureFlags" "build-image-disable-node-corepack"; then
     if [ -d $NETLIFY_CACHE_DIR/yarn ]
     then
       export PATH=$NETLIFY_CACHE_DIR/yarn/bin:$PATH
@@ -187,9 +188,10 @@ run_yarn() {
 
 run_pnpm() {
   pnpm_version=$1
+  featureFlags=$2
   restore_home_cache ".pnpm-store" "pnpm cache"
 
-  if ! [ $(which corepack) ]; then
+  if ! [ $(which corepack) ] || has_feature_flag "$featureFlags" "build-image-disable-node-corepack"; then
     echo "Error while installing PNPM $pnpm_version"
     echo "We cannot install the expected version of PNPM ($pnpm_version) as your required Node.js version $NODE_VERSION does not allow that"
     echo "Please ensure that you use at least Node Version 14.19.0 or greater than 16.9.0"
@@ -266,12 +268,13 @@ run_npm() {
       echo "$(shasum package.json)-$NODE_VERSION" > "$NETLIFY_CACHE_DIR/package-sha"
     fi
   fi
-  
+
   export PATH=$(npm bin):$PATH
 }
 
 install_node() {
   local defaultNodeVersion=$1
+  local featureFlags=$2
 
   source $NVM_DIR/nvm.sh
   : ${NODE_VERSION="$defaultNodeVersion"}
@@ -311,7 +314,7 @@ install_node() {
   fi
 
   # if Node.js Corepack is available enable it
-  if [ $(which corepack) ]; then
+  if [ $(which corepack) ] && ! has_feature_flag "$featureFlags" "build-image-disable-node-corepack"; then
     echo "Enabling node corepack"
     corepack enable
   fi
@@ -366,7 +369,7 @@ install_dependencies() {
   fi
 
   # Node version
-  install_node $defaultNodeVersion
+  install_node "$defaultNodeVersion" "$featureFlags"
 
   # Automatically installed Build plugins
   if [ ! -d "$PWD/.netlify" ]
@@ -604,9 +607,9 @@ install_dependencies() {
     restore_home_cache ".node/corepack" "corepack dependencies"
 
     if [ "$NETLIFY_USE_YARN" = "true" ] || ([ "$NETLIFY_USE_YARN" != "false" ] && [ -f yarn.lock ]); then
-      run_yarn $YARN_VERSION
+      run_yarn $YARN_VERSION "$featureFlags"
     elif [ "$NETLIFY_USE_PNPM" = "true" ] || ([ "$NETLIFY_USE_PNPM" != "false" ] && [ -f pnpm-lock.yaml ]); then
-      run_pnpm $PNPM_VERSION
+      run_pnpm $PNPM_VERSION "$featureFlags"
     else
       run_npm "$featureFlags"
     fi