Add support for multi-arch Docker images (#1362)

## Changes
This PR follows instructions in
https://goreleaser.com/cookbooks/multi-platform-docker-images/ to create
a multi-arch docker CLI image. Thus customers can simply specify `docker
pull ghcr.io/databricks/cli:latest` to pull and run the image.

The current approach uses the `docker manifest` support in goreleaser to
create a multi-arch image. This has a couple of pros and cons. TLDR; The
changes as is in the PR are good to go and very low risk. The
information provided here is just FYI.

pros: 
Fewer configurations/workflows for us to manage/maintain. Goreleaser
makes sure the correct CLI binary is in place when building the CLI and
also takes care of publishing it to the Github Container Registry.

cons:
Goreleaser only supports [docker
manifest](https://docs.docker.com/reference/cli/docker/manifest/) to
create multi-arch images. This has a few minor disadvantages:
1. `goreleaser` pushes all intermediate images (arm64 and and64 specific
images) to the registry. This is required for the manifest to reference
them. See: https://github.com/goreleaser/goreleaser/issues/2606

Note: We have a migration path here, if someday we stop publishing
intermediate images, we can simply tag the "multi-arch" image as both
`latest-amd64` and `latest-arm64`. For now, these are separate images.
see: https://github.com/databricks/cli/pkgs/container/cli

2. `docker manifest` is technically an experimental command. Though it's
been out for multiple years now and the indirect dependency by
`goreleaser` should be fine. In any case, we can migrate by moving our
docker build process off goreleaser if we need to.

## Tests
Tested manually by publishing a new release for `v0.0.0-docker` in
ghcr.io.
1. Package: https://github.com/databricks/cli/pkgs/container/cli
2. Release workflow:
https://github.com/databricks/cli/actions/runs/8689359851

Tests the image itself by running it manually:
```
➜  cli git:(feature/multi-arch-docker) docker pull ghcr.io/databricks/cli:latest
latest: Pulling from databricks/cli
bca4290a9639: Already exists 
6d445556910d: Already exists 
Digest: sha256:82eabc500b541a89182aed4d3158c955e57c1e84d9616b76510aceb1d9024425
Status: Downloaded newer image for ghcr.io/databricks/cli:latest
ghcr.io/databricks/cli:latest

What's Next?
  View a summary of image vulnerabilities and recommendations → docker scout quickview ghcr.io/databricks/cli:latest
➜  cli git:(feature/multi-arch-docker) docker run ghcr.io/databricks/cli --version
Databricks CLI v0.0.0-docker
```

.goreleaser.yaml

@@ -75,6 +75,16 @@ dockers:
       - "./docker/config.tfrc"
       - "./docker/setup.sh"
 
+docker_manifests:
+  - name_template: ghcr.io/databricks/cli:{{replace .Version "+" "-"}}
+    image_templates:
+      - ghcr.io/databricks/cli:{{replace .Version "+" "-"}}-amd64
+      - ghcr.io/databricks/cli:{{replace .Version "+" "-"}}-arm64
+  - name_template: ghcr.io/databricks/cli:latest
+    image_templates:
+      - ghcr.io/databricks/cli:latest-amd64
+      - ghcr.io/databricks/cli:latest-arm64
+
 
 checksum:
   name_template: 'databricks_cli_{{ .Version }}_SHA256SUMS'