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]

@race-of-sloths ping

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@frol	13

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@dj8yfo Thank you for your contribution! Your pull request is now a part of the Race of Sloths!

Current status: waiting for scoring

We're waiting for maintainer to score this pull request with @race-of-sloths score [0,1,2,3,5,8,13] command. Alternatively, autoscoring [1,2] will be applied for this pull request

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[dj8yfo]

fmt applied with https://taplo.tamasfe.dev/

[frol]

@race-of-sloths score 13