.oniro-ci: add timestamps to build bundles

Those timestamps are useful to create unique content in HawkBit
later on. We can always strip them if we want to, but it is hard
to re-create that information when it is not encoded in the file name.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

.oniro-ci/build-generic.yaml

@@ -312,6 +312,8 @@
 .build-rauc-bundle:
   extends: .build-image
   variables:
+    # Put timestamp into bundle name.
+    CI_ONIRO_BB_LOCAL_CONF_IMAGE_VERSION_SUFFIX: "-$${DATETIME}"
     CI_ONIRO_JOB_ARTIFACTS: "*.raucb"
   # Avoid pulling in any artifacts from the previous stage.
   dependencies: []