fix(ci): correct workspace member parsing and relay rustfmt violation

[afbase]

Summary

Fixes two independent CI failures exposed by PR #170.

1. check job — empty package name (determine-workspace-members.sh)

The sed range used to extract workspace members:

sed -n '/\[workspace\]/,/\[/p' Cargo.toml

stops at the first line containing [ after [workspace], which is members = [ itself. The member names on subsequent lines are never captured, so readarray receives an empty string and produces WORKSPACE_MEMBERS=("") — a one-element array of the empty string.

When .github/ changes are detected (as in PR #170 adding dependabot.yml), the script includes all "members" in the matrix, including the empty string. This causes cargo check -p (blank package name) to exit 101.

Fix: replace the broken sed range with awk that properly tracks entry into and exit from the members = [...] block, and guard readarray against an empty result.

/^\[workspace\]/ { in_workspace=1 }
in_workspace && /members[[:space:]]*=/ { in_members=1 }
in_members { print }
in_members && /\]/ { exit }

2. formatting job — rustfmt violation in rsky-relay

cargo fmt -- --check flagged a split match-arm in rsky-relay/src/server/server.rs introduced by the host-banning PR (96e4858). Collapsed to the single line rustfmt expects.

Changes

• Other: CI / tooling fix

Checklist

• I have tested the changes (awk output verified against the workspace Cargo.toml locally)
• I have formatted my code correctly

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