chore(KONFLUX-6210): fix and set name and cpe label for forklift-must-gather-2-8

For https://issues.redhat.com/browse/KONFLUX-6210, clair needs access to a name and cpe label that it can use to look up the image in VEX statements.

See also release-engineering/rhtap-ec-policy#149

Signed-off-by: Ralph Bean <[email protected]>
Assisted-by: Gemini

Author: ralphbean

build/Dockerfile-downstream

@@ -25,4 +25,5 @@ LABEL \
     summary="Migration Toolkit for Virtualization - Must Gather" \
     description="Migration Toolkit for Virtualization - Must Gather" \
     maintainer="Migration Toolkit for Virtualization Team <[email protected]>" \
+    cpe="cpe:/a:redhat:migration_toolkit_virtualization:2.8::el8" \
     revision="$REVISION"