CI: Azure: Build with ASAN enabled

In order to prevent build regressions with ASAN, add the builds to CI.
The longer term objective will be to enabled test targets with ASAN
enabled, but there are too many at the moment.

Signed-off-by: Andrew Scull <ascull@google.com>
diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index ad540ea..915d511 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -473,6 +473,12 @@
           BUILDMAN: "imx8"
         keystone2_keystone3:
           BUILDMAN: "k2 k3"
+        sandbox_asan:
+          BUILDMAN: "sandbox"
+          OVERRIDE: "-a ASAN"
+        sandbox_clang_asan:
+          BUILDMAN: "sandbox"
+          OVERRIDE: "-O clang-13 -a ASAN"
         samsung_socfpga:
           BUILDMAN: "samsung socfpga"
         sun4i: