Aspnet Readmes incorrectly lists non-composite tags for composite images

[lbussell]

Looking at the Aspnet readmes after composite images were added, the composite row in the table lists 8.0-preview-alpine as a valid tag for these images:

dotnet-docker/README.aspnet.md

Lines 77 to 84 in 4819bd1

	##### .NET 8 Preview Tags
	Tags | Dockerfile | OS Version
	-----------| -------------| -------------
	8.0.0-preview.5-bookworm-slim-amd64, 8.0-preview-bookworm-slim-amd64, 8.0.0-preview.5-bookworm-slim, 8.0-preview-bookworm-slim, 8.0.0-preview.5, 8.0-preview, latest | [Dockerfile](https://github.com/dotnet/dotnet-docker/blob/nightly/src/aspnet/8.0/bookworm-slim/amd64/Dockerfile) | Debian 12
	8.0.0-preview.5-alpine3.17-amd64, 8.0-preview-alpine3.17-amd64, 8.0-preview-alpine-amd64, 8.0.0-preview.5-alpine3.17, 8.0-preview-alpine3.17, 8.0-preview-alpine | [Dockerfile](https://github.com/dotnet/dotnet-docker/blob/nightly/src/aspnet/8.0/alpine3.17/amd64/Dockerfile) | Alpine 3.17
	8.0.0-preview.5-alpine3.17-composite-amd64, 8.0-preview-alpine3.17-composite-amd64, 8.0-preview-alpine-composite-amd64, 8.0.0-preview.5-alpine3.17, 8.0-preview-alpine3.17, 8.0-preview-alpine | [Dockerfile](https://github.com/dotnet/dotnet-docker/blob/nightly/src/aspnet/8.0/alpine3.17-composite/amd64/Dockerfile) | Alpine 3.17
	8.0.0-preview.5-jammy-amd64, 8.0-preview-jammy-amd64, 8.0.0-preview.5-jammy, 8.0-preview-jammy | [Dockerfile](https://github.com/dotnet/dotnet-docker/blob/nightly/src/aspnet/8.0/jammy/amd64/Dockerfile) | Ubuntu 22.04
	8.0.0-preview.5-jammy-chiseled-amd64, 8.0-preview-jammy-chiseled-amd64, 8.0.0-preview.5-jammy-chiseled, 8.0-preview-jammy-chiseled | [Dockerfile](https://github.com/dotnet/dotnet-docker/blob/nightly/src/aspnet/8.0/jammy-chiseled/amd64/Dockerfile) | Ubuntu 22.04

However, pulling this tag (on my amd64 machine) always gives me the non-composite image. To fix this we should separate the composite from the non-composite images in the manifest.json, where they are currently grouped under the same shared tags:

dotnet-docker/manifest.json

Lines 3863 to 3964 in 4819bd1

	{
	"productVersion": "$(dotnet|8.0|product-version)",
	"sharedTags": {
	"$(dotnet|8.0|product-version)-alpine3.17": {},
	"8.0-preview-alpine3.17": {},
	"8.0-preview-alpine": {}
	},
	"platforms": [
	{
	"buildArgs": {
	"REPO": "$(Repo:runtime)"
	},
	"dockerfile": "src/aspnet/8.0/alpine3.17/amd64",
	"dockerfileTemplate": "eng/dockerfile-templates/aspnet/Dockerfile.linux",
	"os": "linux",
	"osVersion": "alpine3.17",
	"tags": {
	"$(dotnet|8.0|product-version)-alpine3.17-amd64": {},
	"8.0-preview-alpine3.17-amd64": {},
	"8.0-preview-alpine-amd64": {}
	}
	},
	{
	"architecture": "arm",
	"buildArgs": {
	"REPO": "$(Repo:runtime)"
	},
	"dockerfile": "src/aspnet/8.0/alpine3.17/arm32v7",
	"dockerfileTemplate": "eng/dockerfile-templates/aspnet/Dockerfile.linux",
	"os": "linux",
	"osVersion": "alpine3.17",
	"tags": {
	"$(dotnet|8.0|product-version)-alpine3.17-arm32v7": {},
	"8.0-preview-alpine3.17-arm32v7": {},
	"8.0-preview-alpine-arm32v7": {}
	},
	"variant": "v7"
	},
	{
	"architecture": "arm64",
	"buildArgs": {
	"REPO": "$(Repo:runtime)"
	},
	"dockerfile": "src/aspnet/8.0/alpine3.17/arm64v8",
	"dockerfileTemplate": "eng/dockerfile-templates/aspnet/Dockerfile.linux",
	"os": "linux",
	"osVersion": "alpine3.17",
	"tags": {
	"$(dotnet|8.0|product-version)-alpine3.17-arm64v8": {},
	"8.0-preview-alpine3.17-arm64v8": {},
	"8.0-preview-alpine-arm64v8": {}
	},
	"variant": "v8"
	},
	{
	"buildArgs": {
	"REPO": "$(Repo:runtime-deps)"
	},
	"dockerfile": "src/aspnet/8.0/alpine3.17-composite/amd64",
	"dockerfileTemplate": "eng/dockerfile-templates/aspnet/Dockerfile.linux-composite",
	"os": "linux",
	"osVersion": "alpine3.17",
	"tags": {
	"$(dotnet|8.0|product-version)-alpine3.17-composite-amd64": {},
	"8.0-preview-alpine3.17-composite-amd64": {},
	"8.0-preview-alpine-composite-amd64": {}
	}
	},
	{
	"architecture": "arm",
	"buildArgs": {
	"REPO": "$(Repo:runtime-deps)"
	},
	"dockerfile": "src/aspnet/8.0/alpine3.17-composite/arm32v7",
	"dockerfileTemplate": "eng/dockerfile-templates/aspnet/Dockerfile.linux-composite",
	"os": "linux",
	"osVersion": "alpine3.17",
	"tags": {
	"$(dotnet|8.0|product-version)-alpine3.17-composite-arm32v7": {},
	"8.0-preview-alpine3.17-composite-arm32v7": {},
	"8.0-preview-alpine-composite-arm32v7": {}
	},
	"variant": "v7"
	},
	{
	"architecture": "arm64",
	"buildArgs": {
	"REPO": "$(Repo:runtime-deps)"
	},
	"dockerfile": "src/aspnet/8.0/alpine3.17-composite/arm64v8",
	"dockerfileTemplate": "eng/dockerfile-templates/aspnet/Dockerfile.linux-composite",
	"os": "linux",
	"osVersion": "alpine3.17",
	"tags": {
	"$(dotnet|8.0|product-version)-alpine3.17-composite-arm64v8": {},
	"8.0-preview-alpine3.17-composite-arm64v8": {},
	"8.0-preview-alpine-composite-arm64v8": {}
	},
	"variant": "v8"
	}
	]
	},

[mthalman]

Nice find. Looks like we need some more validation logic in Image Builder. It should not allow duplicate os-type/architecture (e.g. Linux amd64) combinations within a given shared tag.

[mthalman]

Nice find. Looks like we need some more validation logic in Image Builder. It should not allow duplicate os-type/architecture (e.g. Linux amd64) combinations within a given shared tag.

Looks like @MichaelSimons stole my idea: #4635 (comment). 😉

[lbussell]

Fixed in #4635