Improve CI caching (#416)

* Adjust linux distro to ubuntu 14.04

* Cache lib directory for speedy builds

* Fix path linking for default extensions

* Update reset

* Reset to head

* Improve caching

* Still run yarn in CI

* Update yarn before install

* Increase cache timeout

* Install vscode from vstar

* Undo data-dir changes to CLI, add back clean, remove unused CI func

* Remove additional flags added

* Remove unused dependency

* Reset vscode install dir so patching always works

scripts/vstar.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -euxo pipefail
+
+# Builds a tarfile containing vscode sourcefiles neccessary for CI.
+# Done outside the CI and uploaded to object storage to reduce CI time.
+
+branch=1.32.0
+dir=/tmp/vstar
+outfile=/tmp/vstar-$branch.tar.gz
+rm -rf $dir
+mkdir -p $dir
+
+cd $dir
+git clone https://github.com/microsoft/vscode --branch $branch --single-branch --depth=1
+cd vscode
+
+yarn
+
+npx gulp vscode-linux-x64 --max-old-space-size=32384
+rm -rf extensions build out* test
+cd ..
+mv *-x64/resources/app/extensions ./extensions
+rm -rf *-x64
+tar -czvf $outfile .