Push SBOMs with oras
# Summary
In order to work around the current limitations of `cosign attach --sbom`, which currently only supports pushing a single SBOM without combining it with existing SBOMs, we should incorporate the use of [`oras`](https://oras.land/cli/) to push multiple artifacts at once while combining them into a single SBOM artifact
# Example
```bash
oras push localhost:5000/golang:sha256-5a865e8658ea586ae8658655ea865ca86f8e65fe6 golang-1-17-cyclonedx.xml:application/vnd.cyclonedx golang-1-17-syft-json.json:application/vnd.syft+json
```
issue