Add `-L` option to `curl` command #623

Job	Run time
check_lesson_and_build_default	4m 57s
lint_common_files	10s
build-specific-sites (Birmingham_Baskerville_slurm)	36s
build-specific-sites (ComputeCanada_Graham_slurm)	48s
build-specific-sites (EPCC_Cirrus_slurm)	34s
build-specific-sites (HPCC_MagicCastle_slurm)	28s
build-specific-sites (Magic_Castle_EESSI_slurm)	26s
build-specific-sites (NIST_CTCMS_slurm)	18s
build-specific-sites (Norway_SIGMA2_SAGA_slurm)	23s
build-specific-sites (UCL_Myriad_sge)	24s
	9m 4s

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