AZP: Skip RPM install dry-run when rpm db is unreadable

On euleros2sp12 and kylin10sp3 the system rpm db at /var/lib/rpm is
locked down for non-root, so 'rpm -Uvh --test' fails when opening the
db before it can validate the package. Probe with 'rpm -q rpm' and
skip the install test when the db is unreadable, so the check still
runs everywhere it can without hard-failing the build on those two
distros. Also mark the task as SucceededWithIssues so the skip
surfaces as a yellow row in the build summary instead of hiding
behind a green pass.

Signed-off-by: Alexey Rivkin <arivkin@nvidia.com>

Author: Alexey-Rivkin

buildlib/tools/builds.sh

@@ -94,7 +94,12 @@ build_release_pkg() {
 			exit 1
 		fi
 		echo "==== Test install RPM (dry-run) ===="
-		rpm -Uvh --test ${PWD}/rpm-dist/*/*.rpm
+		if rpm -q rpm >/dev/null 2>&1; then
+			rpm -Uvh --test ${PWD}/rpm-dist/*/*.rpm
+		else
+			azure_log_warning "Skip RPM install test: rpm db not readable as non-root"
+			azure_complete_with_issues "Skip RPM install test: rpm db not readable as non-root"
+		fi
 		echo "==== Build debug RPM ===="
 		${WORKSPACE}/contrib/buildrpm.sh -s -b -d --nodeps --define "_topdir $PWD/debug"
 	fi