chore!: remove unsafe `std::env::set_var`

[dj8yfo]

api example for build scripts - build.rs

this has been extensively tested on following cases:

sample-crate

1. https://github.com/dj8yfo/sample_no_workspace/tree/test_remove_unsafe_env_set_var-no-docker => sample-crate-104.testnet

2. https://github.com/dj8yfo/sample_no_workspace/tree/32b06ab1be4bfd49cf54e6cda4e9d8481215195b => sample-crate-105.testnet

factory-rust

1. ok (same bs / image) https://github.com/dj8yfo/factory-rust/tree/c5a970b4fb9436d2d9009035edbd1017e7f31a87 => repro-fct-76.testnet , ...

2. fail (new bs / old image) https://github.com/dj8yfo/factory-rust/tree/f3b9c74d4d759c32274554d598c5c91310e0bf47 => repro-fct-77.testnet , ... fails reproducibility verification, across breaking change boundary (builder version cargo-near-build 0.2.0 -> builder environment version 0.6.4)

3. fail (old bs / new image) https://github.com/dj8yfo/factory-rust/tree/386f8ce9e0d7c8afcc931afb6dc64d564870adaf => repro-fct-78.testnet , ... fails reproducibility verification, across breaking change boundary (builder version cargo-near-build 0.1.0 -> builder environment version cargo-near-build 0.2.0)

neardevhub

1. https://github.com/dj8yfo/neardevhub-contract/tree/e1882a5149168c38841205ecc8370529bf2d3ecb => community.devhub-unse.testnet

2. https://github.com/dj8yfo/neardevhub-contract/tree/e1882a5149168c38841205ecc8370529bf2d3ecb => community.devhub-unsf.testnet

[dj8yfo]

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Current status: executed

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Current status: waiting for scoring

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