Use ubi-minimal for InstaScale runtime image

ubi-micro doesn't contain the usual CA bundles, and since golang relies on those for TLS, you can't do TLS in ubi-micro.
More context can be found at https://project-codeflare.slack.com/archives/C04N7LTP2G5/p1687877553753699 and at
https://serverfault.com/questions/1126941/redhat-ubi8-micro-container-without-trusted-root-ca-certificates

Signed-off-by: Anish Asthana <anishasthana1@gmail.com>

Author: anishasthana

Dockerfile

@@ -17,7 +17,7 @@ COPY controllers/ controllers/
 USER root
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o manager main.go
 
-FROM registry.access.redhat.com/ubi8/ubi-micro:8.7
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.7
 WORKDIR /
 COPY --from=builder /workspace/manager .
 USER 65532:65532