Add crontab-based build (#27) #24

Job	Run time
setup job matrix	4s
setup job matrix	4s
docker (example-currfile.tex)	1m 56s
docker (example-currfile.tex)	2m 7s
linux (example-currfile.tex)	1m 11s
linux (example-currfile.tex)	1m 21s
windows (example-currfile.tex)	4m 10s
windows (example-currfile.tex)	3m 56s
docker (example-expansion-T1.tex)	2m 3s
docker (example-expansion-T1.tex)	2m 3s
windows (example-expansion-T1.tex)	4m 38s
windows (example-expansion-T1.tex)	4m 38s
docker (example-expansion.tex)	2m 9s
docker (example-expansion.tex)	2m 9s
linux (example-expansion-T1.tex)	1m 30s
linux (example-expansion-T1.tex)	1m 30s
windows (example-expansion.tex)	4m 8s
windows (example-expansion.tex)	4m 8s
docker (example-just-article.tex)	2m 18s
docker (example-just-article.tex)	2m 18s
linux (example-expansion.tex)	1m 19s
linux (example-expansion.tex)	1m 19s
windows (example-just-article.tex)	59s
windows (example-just-article.tex)	4m 16s
linux (example-just-article.tex)	1m 29s
linux (example-just-article.tex)	1m 29s
	59m 12s

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