fix: enable release with Homebrew only on stable versions (#455)

Signed-off-by: Yuchen Cheng <rudeigerc@gmail.com>

.goreleaser.yaml

@@ -90,7 +90,7 @@ docker_manifests:
  - ghcr.io/tensorchord/envd-ssh-from-scratch:{{ .Version }}-amd64
  - ghcr.io/tensorchord/envd-ssh-from-scratch:{{ .Version }}-arm64v8
 brews:
- - name: 'envd{{ if filter .Prerelease "alpha" }}@alpha{{ end }}'
+ - name: envd
  ids:
  - envd
  tap:
@@ -103,13 +103,11 @@ brews:
  homepage: https://envd.tensorchord.ai/
  description: Development environment for data science and AI/ML teams
  license: Apache-2.0
- skip_upload: '{{ if filter .Prerelease "rc" }}true{{ else }}false{{ end }}'
+ skip_upload: auto
  caveats: |
  Please run `envd bootstrap` first to bootstrap
  dependencies:
  - name: go
  type: build
- conflicts:
- - envd{{ with not .Prerelease }}@alpha{{ end }}
  test: |
  system "#{bin}/envd version"