Dockerfile: variant selection

Signed-off-by: Stephen Augustus <foo@auggie.dev>

Dockerfile

@@ -59,10 +59,13 @@ FROM base AS test-variant
 COPY --from=builder /go/src/app/test-e2e/cip-auditor/fixture /e2e-fixtures
 
 # Trigger the auditor on startup.
-ENTRYPOINT ["/kpromo cip", "audit", "--verbose"]
+ENTRYPOINT ["/kpromo", "cip", "audit", "--verbose"]
 
 # Production image
 FROM base AS prod-variant
 
 LABEL maintainers="Kubernetes Authors"
 LABEL description="kpromo: The Kubernetes project artifact promoter"
+
+# Allow the runtime argument to choose the final variant.
+FROM ${variant}-variant AS final