fix: initialize docker auth config in mvn-sbom job for private registries

templates/gitlab-ci-maven-jib.yml

@@ -77,6 +77,8 @@ mvn-sbom:
   # force no dependency
   dependencies: []
   script:
+    # initialize Docker auth config
+    - *mvn-jib-scripts
     - mkdir -p -m 777 reports
     - /syft packages $MAVEN_JIB_SNAPSHOT_IMAGE $MAVEN_SBOM_OPTS -o cyclonedx-json=reports/mvn-sbom-${jib_digest}.cyclonedx.json
     - chmod a+r reports/mvn-sbom-${jib_digest}.cyclonedx.json