message: build(populate-cache.sh): Update base image name
diff: #!/bin/sh
  -if [ $BASE_IMAGE = "itkwasm/base" ]; then
  +if [ $BASE_IMAGE = "itkwasm/emscripten-base" ]; then
  cd /MedianFilterPipelineCopy
  /usr/local/bin/web-build web-build -DCMAKE_EXE_LINKER_FLAGS='-flto=thin -s DISABLE_EXCEPTION_CATCHING=0'
  