Use latest available backline in Worker
Studio is locked to the version of backline it was built against
at runtime. This change will allow us to use whatever version of
backline is located on the machine instead when starting a studio
from withint he Worker
export HOME={{pkg.svc_data_path}}
export RUST_LOG={{cfg.log_level}}
export RUST_BACKTRACE=1
+export HAB_STUDIO_BACKLINE_PKG=core/hab-backline
pkg_svc_run="bldr-worker start -c {{pkg.svc_config_path}}/config.toml"
exec ${pkg_svc_run} 2>&1
