internal/pkg: expose snapshot of binfmt entries

This is otherwise not externally accessible. The resulting map can be safely mutated.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/exec.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"maps"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -122,6 +123,15 @@ func RegisterArch(arch string, e container.BinfmtEntry) {
 	binfmt[arch] = e
 }
 
+// Arch returns a snapshot of currently registered [KindExec] and [KindExecNet]
+// binfmt entries.
+func Arch() map[string]container.BinfmtEntry {
+	binfmtMu.RLock()
+	r := maps.Clone(binfmt)
+	binfmtMu.RUnlock()
+	return r
+}
+
 const (
 	// ExecTimeoutDefault replaces out of range [NewExec] timeout values.
 	ExecTimeoutDefault = 15 * time.Minute