message: Fix web builds on Kokoro.
diff: @@ -90,6 +90,7 @@ ISSUE_DESKTOP_BUILD=true
  ISSUE_WEBGL_BUILD=false
  ISSUE_ARCHIVES=false
  +BUILD_JS_DOCS=false
  ISSUE_CMAKE_ALWAYS=false
  @@ -204,10 +205,8 @@ function build_webgl_with_target {
  fi
  if [[ -d "web/filament-js" ]]; then
  - if [[ "$ISSUE_ARCHIVES" == "true" ]]; then
  - which -s python3
  - if [[ $? == 0 ]]; then
  + if [[ "$BUILD_JS_DOCS" == "true" ]]; then
  echo "Generating JavaScript documentation..."
  local DOCS_FOLDER="web/docs"
  local DOCS_SCRIPT="../../web/docs/build.py"
  @@ -216,6 +215,7 @@ function build_webgl_with_target {
  --build-folder ${PWD}
  fi
  + if [[ "$ISSUE_ARCHIVES" == "true" ]]; then
  echo "Generating out/filament-${lc_target}-web.tgz..."
  # The web archive has the following subfolders:
  # dist...core WASM module and accompanying JS file.
  