Test anchors build in CI

Author: wpaulino

.github/workflows/build.yml

@@ -179,6 +179,7 @@ jobs:
           cargo check --no-default-features --features=no-std --release
           cargo check --no-default-features --features=futures --release
           cargo doc --release
+          RUSTDOCFLAGS="--cfg=anchors" cargo doc --release
 
   fuzz:
     runs-on: ubuntu-latest

ci/ci-tests.sh

@@ -89,3 +89,8 @@ if [ "$RUSTC_MINOR_VERSION" -gt 55 ]; then
 	cargo test --verbose --color always
 	popd
 fi
+
+echo -e "\n\nTest anchors builds"
+pushd lightning
+RUSTFLAGS="$RUSTFLAGS --cfg=anchors" cargo test --verbose --color always -p lightning
+popd