Add support to build insider latest build: $ INSIDER=1 ./build/build_mac.sh (#784)

get_repo.sh

@@ -1,12 +1,23 @@
 #!/bin/bash
 
 # figure out latest tag by calling MS update API
-UPDATE_INFO=$(curl https://update.code.visualstudio.com/api/update/darwin/stable/lol)
+if [ "$INSIDER" == "1" ]; then
+	UPDATE_INFO=$(curl https://update.code.visualstudio.com/api/update/darwin/insider/lol)
+else
+	UPDATE_INFO=$(curl https://update.code.visualstudio.com/api/update/darwin/stable/lol)
+fi
 export LATEST_MS_COMMIT=$(echo $UPDATE_INFO | jq -r '.version')
 export LATEST_MS_TAG=$(echo $UPDATE_INFO | jq -r '.name')
-echo "Got the latest MS tag: ${LATEST_MS_TAG}"
+echo "Got the latest MS tag: ${LATEST_MS_TAG} version: ${LATEST_MS_COMMIT}"
 
-git clone https://github.com/Microsoft/vscode.git --branch $LATEST_MS_TAG --depth 1
+if [ "$INSIDER" == "1" ]; then
+	mkdir -p vscode; cd vscode
+	git init ; git remote add origin https://github.com/Microsoft/vscode.git
+	git fetch --depth 1 origin $LATEST_MS_COMMIT; git checkout FETCH_HEAD
+	cd ..
+else
+	git clone https://github.com/Microsoft/vscode.git --branch $LATEST_MS_TAG --depth 1
+fi
 
 # for GH actions
 if [[ $GITHUB_ENV ]]; then