Binary copied to image omitted from SBOM

**What happened**:
SBOM is missing principle binary artifact from image
https://github.com/envoyproxy/envoy/blob/release/v1.27/ci/Dockerfile-envoy
```
ARG ENVOY_BINARY=envoy
ARG ENVOY_BINARY_PREFIX=
COPY --from=binary --chown=0:0 --chmod=755 \
"/usr/local/bin/${ENVOY_BINARY_PREFIX}${ENVOY_BINARY}" /usr/local/bin/envoy
```

**What you expected to happen**:
```
NAME VERSION TYPE
adduser 3.118ubuntu2 deb
apt 2.0.10 deb
base-files 11ubuntu5.8 deb
base-passwd 3.5.47 deb
bash 5.0-6ubuntu1.2 deb
bash 5.0.17 binary
...
envoy 1.27.5 binary
```
**Steps to reproduce the issue**:
syft scan --from registry envoyproxy/envoy:v1.27-latest

**Environment**:
- syft 1.3.0
- OS: attempted on macOS and Centos

Start by reproducing the issue with `syft scan --from registry envoyproxy/envoy:v1.27-latest`, then trace Syft's binary discovery and image-layer analysis using the reported Dockerfile as context. Done means the generated SBOM includes the copied `envoy` binary with its version and type shown as `binary`, without losing existing package entries.

Written by the indexing model from the issue text.