message: [docker] add backbone CI dependency
diff: @@ -61,7 +61,7 @@ ENV OTBR_BUILD_DEPS apt-utils build-essential psmisc ninja-build cmake wget ca-c
  libavahi-client-dev libboost-dev libboost-filesystem-dev libboost-system-dev libjsoncpp-dev
  # Required for OpenThread Backbone CI
  -ENV OTBR_OT_BACKBONE_CI_DEPS curl
  +ENV OTBR_OT_BACKBONE_CI_DEPS curl lcov
  # Required and installed during build (script/bootstrap) when RELEASE=1, could be removed
  ENV OTBR_NORELEASE_DEPS \
  