feat: set update.mode to none when updates are disabled (#2507)

patches/disable-update.patch.yet

@@ -0,0 +1,9 @@
+diff --git a/src/vs/platform/update/common/update.config.contribution.ts b/src/vs/platform/update/common/update.config.contribution.ts
+index d96926b..43f5d90 100644
+--- a/src/vs/platform/update/common/update.config.contribution.ts
++++ b/src/vs/platform/update/common/update.config.contribution.ts
+@@ -20,3 +20,3 @@ configurationRegistry.registerConfiguration({
+ 			enum: ['none', 'manual', 'start', 'default'],
+-			default: 'default',
++			default: 'none',
+ 			scope: ConfigurationScope.APPLICATION,

prepare_vscode.sh

@@ -25,6 +25,10 @@ echo "BINARY_NAME=\"${BINARY_NAME}\""
 echo "GH_REPO_PATH=\"${GH_REPO_PATH}\""
 echo "ORG_NAME=\"${ORG_NAME}\""
 
+if [[ "${DISABLE_UPDATE}" == "yes" ]]; then
+  mv ../patches/disable-update.patch.yet ../patches/disable-update.patch
+fi
+
 for file in ../patches/*.patch; do
   if [[ -f "${file}" ]]; then
     apply_patch "${file}"