Add Windows Server 2019 to Shippable matrix (#51685)

* Test out Server 2019 - ci_complete

* run tests and continue on error - ci_complete

* Add the full matrix back in

(cherry picked from commit 0334c20630)

shippable.yml

@@ -24,24 +24,28 @@ matrix:
     - env: T=windows/2012/1
     - env: T=windows/2012-R2/1
     - env: T=windows/2016/1
+    - env: T=windows/2019/1
 
     - env: T=windows/2008/2
     - env: T=windows/2008-R2/2
     - env: T=windows/2012/2
     - env: T=windows/2012-R2/2
     - env: T=windows/2016/2
+    - env: T=windows/2019/2
 
     - env: T=windows/2008/3
     - env: T=windows/2008-R2/3
     - env: T=windows/2012/3
     - env: T=windows/2012-R2/3
     - env: T=windows/2016/3
+    - env: T=windows/2019/3
 
     - env: T=windows/2008/4
     - env: T=windows/2008-R2/4
     - env: T=windows/2012/4
     - env: T=windows/2012-R2/4
     - env: T=windows/2016/4
+    - env: T=windows/2019/4
 
     - env: T=network
 

test/runner/completion/windows.txt

@@ -3,3 +3,4 @@
 2012
 2012-R2
 2016
+2019