FBC: catalog-build target in Makefile needs to be updated to generate an FBC catalog image

Bug Report

What did you do?

The catalog-build target in Makefile still uses opm index add to generate a SQLite catalog index image. This needs to be updated to generating an FBC index image as we will be defaulting to using File-Based Catalogs once PR is merged into master.

How reproducible: Always

Steps to Reproduce:

1. generate an operator through operator-sdk
2. cat Makefile

What did you expect to see?

Generate the FBC index image in the following way: $ mkdir catalog $ opm generate dockerfile catalog $ mkdir catalog/xxxx $ opm init xxxx -c alpha -o yaml > catalog/xxxx/index.yaml $ opm render quay.io/test/xxxx:v1.0 -o yaml >> catalog/xxxx/index.yaml

What did you see instead? Under which circumstances?

Environment

$ operator-sdk version

operator-sdk version: "v1.20.0-16-g38b8b8d9", commit: "38b8b8d949578a44fb23319e56c242fd620523ca", kubernetes version: "v1.23", go version: "go1.17.4", GOOS: "linux", GOARCH: "amd64"

$ go version (if language is Go)

go version: "go1.17.4"