fix: update steroscope to include OCI platform metadata (#5128)

* Update steroscope to include OCI platform metadata

Signed-off-by: Jason Paulos <jasonpaulos@users.noreply.github.com>

* chore(deps): point stereoscope at anchore/main

drops the fork `replace` directive and moves to a pseudo-version off stereoscope
main (`a22e5ae`, anchore/stereoscope#657). no tag carries it yet, so this should
move to a real version once one is cut.

`readImageMetadata` now fills os/architecture/variant for every provider, not
just oci. the docker tarball provider set neither before, so image metadata and
the image purl change for docker-archive input too:

- `"architecture": ""` -> `"amd64"`
- `"os": ""` -> `"linux"`
- `?arch=` -> `?arch=amd64`

the empty `arch=` qualifier was never right, but it is user-visible output.

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* test: cover single-platform oci layouts

the pr only added assertions to the multiplatform fixture, which already
reported the right platform. the behavior that actually changed is single-image
layouts: they used to report empty os/arch and silently ignore `--platform`, and
now report what the image config says and fail with a platform mismatch.

also drops the non-linux skip on the default-platform test. the oci providers
default to `linux/<GOARCH>` regardless of host os, so it holds on macos too.

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Jason Paulos <jasonpaulos@users.noreply.github.com>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Co-authored-by: Alex Goodman <wagoodman@users.noreply.github.com>

go.sum

@@ -140,14 +140,14 @@ github.com/anchore/go-rpmdb v0.2.0 h1:ixcyMg/guhBL9XjBVwhTv9CG48xO07Qkg2uDX2+zx/
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-github.com/anchore/go-sync v0.1.1 h1:91SZ+YqUIIHmf2jPAYZPuHqM/ZqnK1pVJDWtET6+AJE=
-github.com/anchore/go-sync v0.1.1/go.mod h1:3haGsk2BnaoVhsfqae8Kd0FKIAILE1Hw69P4Xo5iVBw=
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-github.com/anchore/stereoscope v0.3.1/go.mod h1:KHLeUz03/lpsxM8jvs7gFSWRHCXB9MLnxpusCIPe3ME=
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@@ -337,8 +337,8 @@ github.com/distribution/reference v0.6.0 h1:0IXCQ5g4/QMHHkarYzh5l+u8T3t73zM5Qvfr
 github.com/distribution/reference v0.6.0/go.mod h1:BbU0aIcezP1/5jX/8MP0YiH4SdvB5Y4f/wlDRiLyi3E=
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-github.com/docker/cli v29.7.2+incompatible h1:dlkwallR8XqfeVnA2ELEhdwvb4lsSwuB4IgsG8Q9cLY=
-github.com/docker/cli v29.7.2+incompatible/go.mod h1:JLrzqnKDaYBop7H2jaqPtU4hHvMKP+vjCwu2uszcLI8=
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@@ -721,10 +721,10 @@ github.com/moby/docker-image-spec v1.3.1 h1:jMKff3w6PgbfSa69GfNg+zN/XLhfXJGnEx3N
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