Port `duckscript` `condition_script` blocks to Rust

[wmmc88]

          With https://github.com/sagiegurari/cargo-make/issues/1025 being resolved in cargo make v0.37.8, these condition scripts could be refactored to be rust-based for better maintainability, but since its fully functional right now, I'll leave that as a future improvement.

Originally posted by @wmmc88 in #35 (comment)

Also see #35 (comment)

[wmmc88]

The only one remaining is for generate-certificate task