Add `-L` option to `curl` command #622

Job	Run time
check_lesson_and_build_default	4m 58s
lint_common_files	12s
build-specific-sites (Birmingham_Baskerville_slurm)	42s
build-specific-sites (ComputeCanada_Graham_slurm)	1m 4s
build-specific-sites (EPCC_Cirrus_slurm)	53s
build-specific-sites (HPCC_MagicCastle_slurm)	46s
build-specific-sites (Magic_Castle_EESSI_slurm)	39s
build-specific-sites (NIST_CTCMS_slurm)	39s
build-specific-sites (Norway_SIGMA2_SAGA_slurm)	37s
build-specific-sites (UCL_Myriad_sge)	53s
	11m 23s

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