Added step to create header image

cmd/fetch-header-image/main.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/disintegration/imaging"
+)
+
+func main() {
+	targetDir := flag.String("d", ".", "target directory")
+	flag.Parse()
+
+	var bfr bytes.Buffer
+
+	if err := fetchHeaderImage(&bfr, "https://lmika.org/uploads/2025/pxl-20251120-083552448.jpg"); err != nil {
+		log.Fatal(err)
+	}
+
+	img, err := imaging.Decode(&bfr, imaging.AutoOrientation(true))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	rImg := imaging.Resize(img, 1280, 0, imaging.Lanczos)
+
+	fullPath := filepath.Join(*targetDir, "header.jpg")
+	if err := os.MkdirAll(filepath.Dir(fullPath), 0755); err != nil {
+		log.Fatal(err)
+	}
+
+	if err := imaging.Save(rImg, fullPath, imaging.JPEGQuality(70)); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func fetchHeaderImage(w io.Writer, url string) error {
+	r, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer r.Body.Close()
+
+	_, err = io.Copy(w, r.Body)
+	return err
+}