message: [docker] add ca-certificates to DEPS
  This allows initializing the submodules inside docker.
diff: @@ -48,7 +48,7 @@ WORKDIR /app
  ENV OTBR_DOCKER_REQS sudo
  # Required during build, could be removed
  -ENV OTBR_DOCKER_DEPS git
  +ENV OTBR_DOCKER_DEPS git ca-certificates
  # Required and installed during build (script/bootstrap), could be removed
  ENV OTBR_BUILD_DEPS \
  