This commit implements the `manifest` command for `image-builder`.
It will generate an osbuild manifest based on the given inputs,
e.g.:
```
$ ./image-builder manifest centos-9 qcow2
{"version":"2","pipelines":[{"name":"build","runner":",...
```
Note that there is an integration test but because of the depsolve
it will be slow. It will be skipped when doing `go test -short`.
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| .. | ||
| export_test.go | ||
| filters.go | ||
| filters_test.go | ||
| list.go | ||
| main.go | ||
| main_test.go | ||
| repos.go | ||