[OPENJDK-2519] tzdata module depend upon pkg-update

Document (as a comment) the issue of ordering pkg-update and
tzdata modules. Depend upon the pkg-update module from tzdata,
to ensure it runs first always. This has no effect on the
container images as they stand now, since they have pkg-config
occurring first already, but if that changed, this would catch
it.

Signed-off-by: Jonathan Dowland <[email protected]>

Author: jmtd

modules/util/tzdata/module.yaml

@@ -1,7 +1,14 @@
 schema_version: 1
 name: jboss.container.util.tzdata
 version: '1.0'
-description: Reinstall the tzdata package, to ensure zoneinfo is present
+description: Reinstall the tzdata package, to ensure zoneinfo is present.
+
+# if the base image tzdata version is not available on the RPM mirrors (such as
+# when it has been updated), the reinstall action will fail. To prevent this,
+# run pkg-update first.
+modules:
+  install:
+  - name: jboss.container.util.pkg-update
 
 execute:
 - script: execute.sh