fix(web): .env should not build to static assets

[Aralhi]

• web/.env should not build to static assets

source_env=".env"
tmp_env=".env.copy"

# copy .env to a temp file
if [ -e "$source_env" ]; then
  cp "$source_env" "$tmp_env"
  rm -rf "$source_env"
else
  echo "Do not find .env"
fi

# rollback after build success.
if [ -e "$tmp_env" ]; then
  cp "$tmp_env" "$source_env" 
  rm -rf "$tmp_env"
fi

[csunny]

LGTM 🚀

[fangyinc]

LGTM.