Add `-L` option to `curl` command #625

Job	Run time
lint_common_files	16s
build-specific-sites (Birmingham_Baskerville_slurm)	19s
check_lesson_and_build_default	4m 17s
build-specific-sites (ComputeCanada_Graham_slurm)	48s
build-specific-sites (EPCC_Cirrus_slurm)	19s
build-specific-sites (HPCC_MagicCastle_slurm)	21s
build-specific-sites (Magic_Castle_EESSI_slurm)	31s
build-specific-sites (NIST_CTCMS_slurm)	20s
build-specific-sites (Norway_SIGMA2_SAGA_slurm)	31s
build-specific-sites (UCL_Myriad_sge)	20s
	8m 2s

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