Get just the static container volume in build

This is done because the CI (Jenkins) will have multiple running containers and it might send two volumes back bricking the docker run command generated by the script.

Author: serban-nicusor-toptal

scripts/build_multiarch_stanc3.sh

@@ -26,7 +26,7 @@ SHA=$(skopeo inspect --raw docker://stanorg/stanc3:multiarch | jq '.manifests |
 docker run --rm --privileged multiarch/qemu-user-static --reset
 
 # Run docker, inheriting mounted volumes from sibling container (including stanc3 directory), and build stanc3
-docker run --volumes-from=$(docker ps -q):rw stanorg/stanc3:multiarch@$SHA /bin/bash -c "cd $(pwd) && eval \$(opam env) && dune build @install --profile static"
+docker run --volumes-from=$(docker ps -aqf "ancestor=stanorg/stanc3:static"):rw stanorg/stanc3:multiarch@$SHA /bin/bash -c "cd $(pwd) && eval \$(opam env) && dune build @install --profile static"
 
 # Update ownership of build folders
 chown -R opam: _build