Add packaging and release automation

vendor/github.com/alecthomas/chroma/v2/.goreleaser.yml

@@ -0,0 +1,34 @@
+project_name: chroma
+release:
+  github:
+    owner: alecthomas
+    name: chroma
+brews:
+  - install: bin.install "chroma"
+env:
+  - CGO_ENABLED=0
+builds:
+  - goos:
+      - linux
+      - darwin
+      - windows
+    goarch:
+      - arm64
+      - amd64
+      - "386"
+    goarm:
+      - "6"
+    dir: ./cmd/chroma
+    main: .
+    ldflags: -s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.Date}}
+    binary: chroma
+archives:
+  - format: tar.gz
+    name_template: "{{ .Binary }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
+    files:
+      - COPYING
+      - README*
+snapshot:
+  name_template: SNAPSHOT-{{ .Commit }}
+checksum:
+  name_template: "{{ .ProjectName }}-{{ .Version }}-checksums.txt"