add Google SRE books (#12114)

* add Google SRE books

* Update books/free-programming-books-subjects.md

Co-authored-by: Eric Hellman <eric@hellman.net>

* Update books/free-programming-books-subjects.md

Co-authored-by: Eric Hellman <eric@hellman.net>

* Update books/free-programming-books-subjects.md

Co-authored-by: Eric Hellman <eric@hellman.net>

---------

Co-authored-by: Phu Nguyen <phunguyen@macbook-m3-pro.local>
Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-subjects.md

@@ -614,6 +614,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Asterisk™: The Definitive Guide](https://solmu.org/pub/help/Asterisk/3nd_Edition_for_Asterisk_1.8) - Leif Madsen, Jim Van Meggelen, Russell Bryant (HTML)
 * [Atomic Design](https://atomicdesign.bradfrost.com) - Brad Frost
 * [Barcode Overview](https://www.tec-it.com/download/PDF/Barcode_Reference_EN.pdf) (PDF)
+* [Build Secure & Reliable System - Best Practice for Designing, Implementing and Maintaining Systems](https://google.github.io/building-secure-and-reliable-systems/raw/toc.html) - Heather Adkins, Betsy Beyer, Paul Plankinship, Piotr Lewandowski, Ana Oprea, Adam Stubblefield (HTML)
 * [Come, Let's Play: Scenario-Based Programming Using Live Sequence Charts](https://www.wisdom.weizmann.ac.il/~playbook/) - David Harel, Rami Marelly
 * [Communicating Sequential Processes](http://www.usingcsp.com/cspbook.pdf) - Tony Hoare (PDF)
 * [Confessions of an Unintentional CTO: Lessons in Growing a Web App](https://www.jackkinsella.ie/books/confessions_of_an_unintentional_cto) - Jack Kinsella
@@ -669,8 +670,10 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Record-Playback Test Automation: Sahi & Selenium IDE: Critical Evaluation of Record-Playback Automation Tools](https://leanpub.com/manualToAutomatedWithSeleniumIDEAndSahi) - Shashikant Jagtap *(Leanpub account or valid email requested)*
 * [Scientific Programming and Computer Architecture](https://divakarvi.github.io/bk-spca/spca.html) - Divakar Viswanath
 * [Signal Computing: Digital Signals in the Software Domain](http://faculty.washington.edu/stiber/pubs/Signal-Computing/Signal%20Computing.pdf) - Michael Stiber, Bilin Zhang Stiber, Eric C. Larson (PDF)
+* [Site Reliability Engineering - How Google run production systems](https://sre.google/sre-book/table-of-contents/) - Betsy Beyer, Chris Jones, Jennifer Petoff, Niall Murphy (HTML)
 * [Small Memory Software](https://smallmemory.charlesweir.com/book.html) - Charles Weir, James Noble (HTML)
 * [Software Technical Writing: A Guidebook](https://jamesg.blog/book.pdf) - James Gallagher (PDF)
+* [The Site Reliability Workbook - Practical Ways to Implement SRE](https://sre.google/workbook/table-of-contents/) - Betsy Beyer, Niall Richard Murphy, David K. Rensin, Kent Kawahara, Stephen Thorne (HTML)
 * [The Web Development Glossary](https://github.com/frontenddogma/web-development-glossary) – Jens Oliver Meiert
 * [Using Z Specification, Refinement, and Proof](http://www.usingz.com/usingz.pdf) -  Jim Woodcock, Jim Davies (PDF)
 * [Web Almanac](https://almanac.httparchive.org/static/pdfs/web_almanac_2019_en.pdf) (PDF)