policy: add unit test for policy taking `self` as platform reference · intel/MigTD@0106fcc

The following actions uses node12 which is deprecated and will be forced to run on node16: actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

/home/runner/work/MigTD/MigTD/src/devices/vsock/Cargo.toml: unused manifest key: dependencies.td-payload.feature

unused import: `std::process::Command`

`attestation` (build script) generated 1 warning

/home/runner/work/MigTD/MigTD/src/devices/vsock/Cargo.toml: unused manifest key: dependencies.td-payload.feature

unused import: `std::process::Command`

`attestation` (build script) generated 1 warning

unused import: `core::arch::asm`

unused import: `eoi`

`vsock` (lib) generated 2 warnings (run `cargo fix --lib -p vsock` to apply 2 suggestions)

/home/runner/work/MigTD/MigTD/src/devices/vsock/Cargo.toml: unused manifest key: dependencies.td-payload.feature

unused import: `std::process::Command`

`attestation` (build script) generated 1 warning

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