Extend packagecloud-push for build-dir

Extend script packagecloud-push.sh with environment variable BUILD_DIR.
Populate BUILD_DIR from JJB config parameter build-dir, required for
cmake anyhow.  This limits the search to a single directory.

Add build-dir default to docker-ci template, "export-packages"

Revise export script to use a constant value for build-dir,
also "export-packages" in $WORKSPACE.

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I3da170246fb5868e644756e80c20b07bf68f55f9
diff --git a/jjb/oran-templates/oran-docker-ci-jobs.yaml b/jjb/oran-templates/oran-docker-ci-jobs.yaml
index 601aee1..93c431b 100644
--- a/jjb/oran-templates/oran-docker-ci-jobs.yaml
+++ b/jjb/oran-templates/oran-docker-ci-jobs.yaml
@@ -132,6 +132,7 @@
       - shell: "{post_docker_build_script}"
       - oran-docker-build-export
       - oran-packagecloud-push:
+          build-dir: export-packages # directory with deb/rpm files
           packagecloud-account: "{packagecloud-account}"
           packagecloud-repo: "{packagecloud-repo}"
           debian-distribution-versions: "{debian-distribution-versions}"