Build transfer hook for downstream project

[LucasSte]

Problem

When running ci/downstream-projects/func-spl.sh, the binary for spl_transfer_hook_example.so is missing and we get the error:

---- test::test_create stdout ----
thread 'test::test_create' panicked at /Users/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/solana-program-test-1.17.17/src/lib.rs:451:31:
Failed to open "../../../target/deploy/spl_transfer_hook_example.so": No such file or directory (os error 2)

Summary of Changes

I added a command to build the aforementioned binary.

[yihau]

looks good to me! but I defer to Jon. need his insight here.

[joncinque]

I don't think this script is really used anymore, but rather than add it as a separate step, how about adding token/transfer-hook/example to the list of programs to run test-sbf on? You can add it after instruction-padding/program on line 7.

[LucasSte]

I don't think this script is really used anymore, but rather than add it as a separate step, how about adding token/transfer-hook/example to the list of programs to run test-sbf on? You can add it after instruction-padding/program on line 7.

Thanks for your review. I'll implement your suggestion.

This script is still useful for verifying the integration between the compiler toolchain and the virtual machine, as it compiles and runs a bunch of SBF programs.

[joncinque]

Looks good to me!