ci(ldk): also run fmt/clippy in workloads/ldk

[ekzyis]

close #201

Btw, I can recommend running the quick part of the CI locally before committing with git hooks:

$ mkdir .githooks
$ cat > .githooks/pre-commit <<EOF
# pre-commit hook

set -xeu

cargo fmt --all --check
cargo fmt --check --manifest-path workloads/ldk/Cargo.toml
cargo clippy --all-features --all-targets -- -D warnings
cargo clippy --all-targets --manifest-path workloads/ldk/Cargo.toml -- -D warnings
cargo test --all-features --all-targets
EOF
$ git config core.hooksPath .githooks

[morehouse]

I think we should probably duplicate the [workspace.lints.clippy] and [workspace.lints.rust] sections from Cargo.toml to workloads/ldk/Cargo.toml.

[ekzyis]

I think we should probably duplicate the [workspace.lints.clippy] and [workspace.lints.rust] sections from Cargo.toml to workloads/ldk/Cargo.toml.

Right, I wasn't running clippy with our root workspace rules. Done in 511d8a9.