Replace cargo build calls in CI with cargo check

We're not actually using the build output, so there's no reason to
do a build vs just running check.

Author: TheBlueMatt

ci/ci-tests.sh

@@ -45,29 +45,29 @@ export RUST_BACKTRACE=1
 
 echo -e "\n\nBuilding and testing all workspace crates..."
 cargo test --verbose --color always
-cargo build --verbose --color always
+cargo check --verbose --color always
 
 echo -e "\n\nBuilding and testing Block Sync Clients with features"
 pushd lightning-block-sync
 cargo test --verbose --color always --features rest-client
-cargo build --verbose --color always --features rest-client
+cargo check --verbose --color always --features rest-client
 cargo test --verbose --color always --features rpc-client
-cargo build --verbose --color always --features rpc-client
+cargo check --verbose --color always --features rpc-client
 cargo test --verbose --color always --features rpc-client,rest-client
-cargo build --verbose --color always --features rpc-client,rest-client
+cargo check --verbose --color always --features rpc-client,rest-client
 cargo test --verbose --color always --features rpc-client,rest-client,tokio
-cargo build --verbose --color always --features rpc-client,rest-client,tokio
+cargo check --verbose --color always --features rpc-client,rest-client,tokio
 popd
 
 if [[ $RUSTC_MINOR_VERSION -gt 67 && "$HOST_PLATFORM" != *windows* ]]; then
 	echo -e "\n\nBuilding and testing Transaction Sync Clients with features"
 	pushd lightning-transaction-sync
 	cargo test --verbose --color always --features esplora-blocking
-	cargo build --verbose --color always --features esplora-blocking
+	cargo check --verbose --color always --features esplora-blocking
 	cargo test --verbose --color always --features esplora-async
-	cargo build --verbose --color always --features esplora-async
+	cargo check --verbose --color always --features esplora-async
 	cargo test --verbose --color always --features esplora-async-https
-	cargo build --verbose --color always --features esplora-async-https
+	cargo check --verbose --color always --features esplora-async-https
 	popd
 fi
 
@@ -93,7 +93,7 @@ fi
 echo -e "\n\nBuilding with all Log-Limiting features"
 pushd lightning
 grep '^max_level_' Cargo.toml | awk '{ print $1 }'| while read -r FEATURE; do
-	cargo build --verbose --color always --features "$FEATURE"
+	cargo check --verbose --color always --features "$FEATURE"
 done
 popd