Compute and upload sha256 sums for build artifacts

sum.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+sum_file () {
+  if [[ -f "$1" ]]; then
+    shasum -a 256 $1 > $1.sha256
+  fi
+}
+
+if [[ "$SHOULD_BUILD" == "yes" ]]; then
+  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+    sum_file VSCodium-darwin-*.zip
+  elif [[ "$CI_WINDOWS" == "True" ]]; then
+    sum_file VSCodium-win32*.zip
+    sum_file VSCodiumSetup*.exe
+    sum_file VSCodiumUserSetup*.exe
+  else # linux
+    if [[ "$BUILDARCH" == "x64" ]]; then
+      deb_arch=amd64
+      rpm_arch=x86_64
+    elif [[ "$BUILDARCH" == "ia32" ]]; then
+      deb_arch=i386
+      rpm_arch=i386
+    fi
+    sum_file VSCodium-linux*.tar.gz
+    sum_file vscode/.build/linux/deb/$(arch)/deb/*.deb
+    sum_file vscode/.build/linux/rpm/$(arch_alt)/*.rpm
+  fi
+fi