publish: Publish layers manifest with tag

Publish the non-OCI compliant layers manifest with a tag. It helps to
overcome the error that occurs during manifest posting in the
distribution code. For some reason, it invokes
`distribution.UnmarshalManifest` to calculate manifest digest which
deserializes and serializes the manifest and checks manifest
consistency. The latter yields the error because the layers manifest has
an image index media type which is not correct if a manifest has layers.

While, the layers manifest is not OCI compiant there is no any reason to
invoke `distribution.UnmarshalManifest` to calculate manifest digest if
just `digest.FromBytes(manifest.Payload())` could be invoked...

This change simply sets the tag for the manifest reference to be
published which helps to bypass the code that invokes
`distribution.UnmarshalManifest` and avoid the error.

The following code verifies/compares the published digest with expected
one which guarantees consistency.

Signed-off-by: Mike Sul <[email protected]>

go.mod

@@ -2,8 +2,6 @@ module github.com/foundriesio/composeapp
 
 go 1.22
 
-replace github.com/docker/distribution => github.com/docker/distribution v2.7.1+incompatible
-
 require (
 	github.com/compose-spec/compose-go v1.20.2
 	github.com/containerd/containerd v1.7.15

go.sum

@@ -36,8 +36,8 @@ 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=
 github.com/docker/cli v25.0.3+incompatible h1:KLeNs7zws74oFuVhgZQ5ONGZiXUUdgsdy6/EsX/6284=
 github.com/docker/cli v25.0.3+incompatible/go.mod h1:JLrzqnKDaYBop7H2jaqPtU4hHvMKP+vjCwu2uszcLI8=
-github.com/docker/distribution v2.7.1+incompatible h1:a5mlkVzth6W5A4fOsS3D2EO5BUmsJpcB+cRlLU7cSug=
-github.com/docker/distribution v2.7.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
+github.com/docker/distribution v2.8.1+incompatible h1:Q50tZOPR6T/hjNsyc9g8/syEs6bk8XXApsHjKukMl68=
+github.com/docker/distribution v2.8.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
 github.com/docker/docker v25.0.3+incompatible h1:D5fy/lYmY7bvZa0XTZ5/UJPljor41F+vdyJG5luQLfQ=
 github.com/docker/docker v25.0.3+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/docker-credential-helpers v0.7.0 h1:xtCHsjxogADNZcdv1pKUHXryefjlVRqWqIhk/uXJp0A=

pkg/compose/layers.go

@@ -288,7 +288,7 @@ func PostAppLayersManifests(ctx context.Context, appRef string, layers map[strin
 			fmt.Printf("  |-> skipping layer manifest publishing for dryrun\n")
 		} else {
 			fmt.Printf("  |-> posting a layer manifest for architecture: %s...", arch)
-			digest, err := manSvc.Put(ctx, manifest)
+			digest, err := manSvc.Put(ctx, manifest, distribution.WithTag("layers-"+arch+(desc.Digest.Hex())[:7]))
 			if err != nil {
 				return nil, err
 			}