`tmpl` takes a long time to compile on a Raspberry Pi, so I've created a
CI pipeline to build it separately.
`kcl` seems to have a [bug][0] that causes it to include the x86_64
builds of `kclvm_cli` and `libkclvm_cli_cdylib.so` on aarch64. This
naturally doesn't work, so we need to fetch the correct builds
ourselves.
[0]: https://github.com/kcl-lang/cli/issues/31