Fix Dagger pipeline: export built binaries to dist/ directory on host

ci/dagger.go

@@ -0,0 +1,54 @@
+// Dagger pipeline for multi-platform builds.
+// Requires: go install dagger.io/dagger@latest && go mod tidy
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"dagger.io/dagger"
+)
+
+func main() {
+	ctx := context.Background()
+	client, err := dagger.Connect(ctx, dagger.WithLogOutput(os.Stdout))
+	if err != nil {
+		panic(err)
+	}
+	defer client.Close()
+
+	platforms := []struct {
+		OS   string
+		Arch string
+	}{
+		{"darwin", "arm64"},
+		{"darwin", "amd64"},
+		{"windows", "amd64"},
+		{"linux", "amd64"},
+	}
+
+	src := client.Host().Directory(".")
+
+	for _, p := range platforms {
+		binName := fmt.Sprintf("valhallir-deconvolver-%s-%s", p.OS, p.Arch)
+		if p.OS == "windows" {
+			binName += ".exe"
+		}
+
+		ctr := client.Container().From("golang:1.24.5").
+			WithMountedDirectory("/src", src).
+			WithWorkdir("/src").
+			WithEnvVariable("GOOS", p.OS).
+			WithEnvVariable("GOARCH", p.Arch).
+			WithExec([]string{"go", "build", "-o", binName, "."})
+
+		// Export the binary from the container to the host's dist/ directory
+		outPath := fmt.Sprintf("dist/%s", binName)
+		_, err := ctr.File(binName).Export(ctx, outPath)
+		if err != nil {
+			panic(fmt.Sprintf("export failed for %s/%s: %v", p.OS, p.Arch, err))
+		}
+		fmt.Printf("Built and exported %s\n", outPath)
+	}
+}