Add support to SRE Workbook.

[aabouzaid]

These changes to make the scripts more generic to add support to SRE Workbook.

Now we can generate books based on env variable.
e.g. to generate The Site Reliability Workbook (2018) book (after using image from this PR of course)

docker run --rm --volume "$(pwd):/output" -e BOOK_SLUG='srw_book' captn3m0/google-sre-ebook:latest

This fixes issue no. #19

Thanks.

[kingdonb]

Awesome! You beat me to it, testing now

[kingdonb]

I found a lot of

Hyperlink target u'ch025.xhtml#level-of-sre-engagement-during-the-service-lifecycle' not found
Hyperlink target u'ch017.xhtml#ch11fn5' not found
Hyperlink target u'ch017.xhtml#ch11fn4' not found
Hyperlink target u'ch017.xhtml#ch11fn1' not found
Hyperlink target u'ch017.xhtml#ch11fn3' not found
Hyperlink target u'ch017.xhtml#ch11fn2' not found
Hyperlink target u'ch009.xhtml#practical-alerting' not found
Hyperlink target u'ch015.xhtml#service-fault' not found
Hyperlink target u'ch007.xhtml#slo-compliance-report' not found
Hyperlink target u'ch005.xhtml#id-e82c8uwuxc1' not found

messages in the output, for both books. Not sure if this is a regression, but it seems that most of the links are still there and working, at least in the PDF format – I was able to generate all formats of both books from this branch. I will play-test them today. Thanks!

[kingdonb]

The updates are great! Both books are showing up with images properly included in the pages now, on mobi format. You have done a better job fixing this up than I was prepared to do. I will see if I can find out more about the apparently broken links, but I only found working links while I was browsing through the content myself, so apparently if there are broken links, it's only some of them.

The irony is also not lost on me that I am reading Google's SRE books on Amazon's reader device, ha ha...

[captn3m0]

🥇

[aabouzaid]

@kingdonb Thanks for your comments :-)

This problem happens with old version too.
Honestly I didn't look into it since no much effect on the result.

@captn3m0 Thanks for the merging :-)

[captn3m0]

Thanks a lot @aabouzaid, this looks great 💯

Now that we have both books covered, I've created an issue to track typesetting or other reading issues: #22

Will take them up one by one, but feel free to add issues there.