rpm-ostree: Fix version checks for container path

Starting with rpm-ostree v2024.3, the version is only set with the
'org.opencontainers.image.version' label and no longer with the
'version' one.

Check the new label first and the old one second to be compatible with
all images.

See:
- https://github.com/coreos/rpm-ostree/releases/tag/v2024.3
- coreos/rpm-ostree#4794
- ostreedev/ostree-rs-ext#581

libdiscover/backends/RpmOstreeBackend/RpmOstreeTransaction.cpp

@@ -215,12 +215,17 @@ void RpmOstreeTransaction::processCommand(int exitCode, QProcess::ExitStatus exi
                 return;
             }
 
-            // Get the version stored in .Labels.version
-            const QString newVersion = jsonDocument.object().value("Labels").toObject().value("version").toString();
+            // Get the version stored in 'org.opencontainers.image.version' label
+            QString newVersion =
+                jsonDocument.object().value(QLatin1String("Labels")).toObject().value(QLatin1String("org.opencontainers.image.version")).toString();
             if (newVersion.isEmpty()) {
-                qInfo() << "rpm-ostree-backend: Could not get the version from the container labels";
-                setStatus(Status::DoneWithErrorStatus);
-                return;
+                // Check the 'version' label for compatibility with older rpm-ostree releases (< v2024.03)
+                newVersion = jsonDocument.object().value(QLatin1String("Labels")).toObject().value(QLatin1String("version")).toString();
+                if (newVersion.isEmpty()) {
+                    qWarning() << "rpm-ostree-backend: Could not get the version from the container labels";
+                    setStatus(Status::DoneWithErrorStatus);
+                    return;
+                }
             }
 
             QVersionNumber newVersionNumber = QVersionNumber::fromString(newVersion);