ci-dockerfiles-sanity-check: Add job timeout

We had cases where pip hanged in version resolution stage for many hours.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Iae1f1d7d4ee1f4c94774579f7eaab946072df437
diff --git a/ci-dockerfiles-sanity-check.yaml b/ci-dockerfiles-sanity-check.yaml
index 23784a9..8fe7569 100644
--- a/ci-dockerfiles-sanity-check.yaml
+++ b/ci-dockerfiles-sanity-check.yaml
@@ -68,6 +68,9 @@
         sequential: false
     wrappers:
         - timestamps
+        - timeout:
+            timeout: 60
+            fail: true
     builders:
         - shell:
             !include-raw: ci-dockerfiles-deployment/build-version.sh