Revision of Multi-Architecture OCI Image

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README.md

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	1	+	Add multi-architecture support to an OCI image.
	2	+
	3	+	> SudoVanilla uses [`buildah`](https://buildah.io/) instead of Docker, as it
	4	+	> builds valid OCI images that are supported by the SudoVanilla OCI Registry.
	5	+	> The [SudoVanilla OCI Registry](https://oci.registry.sudovanilla.org/) is
	6	+	> powered by [Zot Registry](https://zotregistry.dev/), a OCI-native container
	7	+	> image registry.
	8	+
	9	+	## Build or Pull Images
	10	+
	11	+	Build Image
	12	+	```bash
	13	+	buildah build -t registry.org/image:amd64
	14	+	buildah build -t registry.org/image:amd64
	15	+	```
	16	+
	17	+	Pull Image
	18	+
	19	+	```bash
	20	+	buildah pull -t registry.org/image:arm64
	21	+	buildah pull -t registry.org/image:arm64
	22	+	```
	23	+
	24	+	## Manifest
	25	+	### Create
	26	+
	27	+	Use the `manifest create` command to generate a new OCI image index and give it the `latest` tag name.
	28	+	```bash
	29	+	buildah manifest create registry.org/image:latest
	30	+	```
	31	+
	32	+	### Combine Images
	33	+
	34	+	Using the previous images that was previously built or pulled, apply them to the newly created manifest:
	35	+	```bash
	36	+	buildah manifest add registry.org/image:latest registry.org/image:arm64
	37	+	buildah manifest add registry.org/image:latest registry.org/image:arm64
	38	+	```
	39	+
	40	+	### Push Image
	41	+
	42	+	You can now push the `latest` tag to your preferred registry and it'll be uploaded with both architecture images intact.
	43	+	```bash
	44	+	buildah manifest push registry.org/image:latest
	45	+	```

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