ci: enable CGO and add Zig setup

-  Remove CGO_ENABLED=0 and enable CGO_ENABLED=1 in .goreleaser.yml
-  Install Zig via setup-zig action in release workflow
-  Set CC=zig cc in CI env for cross-platform builds

Author: epilande

.goreleaser.yml

@@ -3,17 +3,11 @@ before:
   hooks:
     - go mod tidy
 builds:
-  - binary: grab
+  - id: grab
+    binary: grab
     main: ./cmd/grab
-    goos:
-      - darwin
-      - linux
-      - windows
-    goarch:
-      - amd64
-      - arm64
-    env:
-      - CGO_ENABLED=0
+    goos: [darwin, linux, windows]
+    goarch: [amd64, arm64]
     ldflags:
       - -s -w
       - -X github.com/epilande/codegrab/internal/utils.Version={{.Version}}