chore: migrate goreleaser config to v2

- Add version: 2 for goreleaser v2 compatibility
- Migrate brews → homebrew_casks (brews deprecated)
- Change directory: Formula → Casks
- Replace install block with binaries list
- Add token for homebrew-tap authentication
- Add ignore rules for Windows/Darwin ARM (broken targets)
- Add archives section with ARM version suffix
- Add checksum, snapshot, changelog sections
- Add ldflags for version/commit/date injection
- Rename .goreleaser.yml → .goreleaser.yaml

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kwent

.goreleaser.yaml

@@ -0,0 +1,100 @@
+version: 2
+
+project_name: rootly
+
+before:
+  hooks:
+    - go mod tidy
+
+builds:
+  - id: rootly
+    main: ./cmd/rootly
+    binary: rootly
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -tags=netgo
+      - -a
+      - -v
+    goos:
+      - linux
+      - darwin
+      - windows
+    goarch:
+      - amd64
+      - arm64
+      - arm
+    goarm:
+      - "6"
+      - "7"
+    ignore:
+      - goos: windows
+        goarch: arm
+      - goos: darwin
+        goarch: arm
+    ldflags:
+      - -s -w
+      - -extldflags "-static"
+      - -X main.version={{.Version}}
+      - -X main.commit={{.Commit}}
+      - -X main.date={{.Date}}
+
+archives:
+  - id: default
+    formats:
+      - tar.gz
+    format_overrides:
+      - goos: windows
+        formats:
+          - zip
+    name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ with .Arm }}v{{ . }}{{ end }}"
+    files:
+      - README.md
+      - LICENSE
+
+checksum:
+  name_template: "checksums.txt"
+
+snapshot:
+  version_template: "{{ incpatch .Version }}-next"
+
+changelog:
+  sort: asc
+  use: github
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+      - "^chore:"
+      - "^ci:"
+      - Merge pull request
+      - Merge branch
+  groups:
+    - title: Features
+      regexp: '^.*?feat(\([[:word:]]+\))??!?:.+$'
+      order: 0
+    - title: Bug Fixes
+      regexp: '^.*?fix(\([[:word:]]+\))??!?:.+$'
+      order: 1
+    - title: Other
+      order: 999
+
+homebrew_casks:
+  - repository:
+      owner: rootlyhq
+      name: homebrew-tap
+      token: "{{ .Env.HOMEBREW_TAP_GITHUB_TOKEN }}"
+    directory: Casks
+    homepage: "https://rootly.com"
+    description: "Command line tool for rootly.com"
+    binaries:
+      - rootly
+
+release:
+  github:
+    owner: rootlyhq
+    name: cli
+  draft: false
+  prerelease: auto
+  mode: replace
+  name_template: "v{{ .Version }}"