[BUG] Kagami fails to generate a validator when runs outside of the repo dir

[0x009922]

OS and Environment

macOS 13.2.1 (22D68)

GIT commit hash

d7e054d

Minimum working example / Steps to reproduce

1. Create a directory:

   mkdir test && cd test

2. Install kagami binary there:

   cargo install --git https://github.com/hyperledger/iroha.git \
      --rev d7e054d3aca37f1a93383d2318e7b46fa76e0010 \ # or simply `--branch iroha2-dev`
      --root ./cargo-install-root \
      kagami

3. Run compiled kagami:

   ./cargo-install-root/bin/kagami validator

Actual result

Error:
   0: Failed to construct absolute path for: ../../default_validator
   1: Expected `CARGO_MANIFEST_DIR` environment variable
   2: environment variable not found

Expected result

Expected to get the compiled wasm blob.

Logs in JSON format

N/A

Who can help to reproduce?

No response

Notes

Kagami relies to be always executed in the root of the repo:

iroha/tools/kagami/src/main.rs

Lines 815 to 826 in d7e054d

	pub fn construct_validator() -> color_eyre::Result<Vec<u8>> {
	let build_dir = tempfile::tempdir()
	.wrap_err("Failed to create temp dir for runtime validator output")?;
	let wasm_blob = iroha_wasm_builder::Builder::new("../../default_validator")
	.out_dir(build_dir.path())
	.build()?
	.optimize()?
	.into_bytes();
	Ok(wasm_blob)
	}

I don't think this is correct - Kagami should be a standalone, self-contained binary with "all batteries included". So, the wasm binary should be inlined into the binary itself.

This functionality is essential for #2373, which I am working on now. Thus, I assign this issue to myself.

[timofeevmd]

mac m1 test

test on linux x86 gives the same results

[ilchu]

mac m1 test
...
test on linux x86 gives the same results

Should be addressed by #3748.