fix: create the cache directory before writing last-checked file

If the cache directory is gone, then, currently, writing the
last-checked file fails. This change ensures that the directory exists
before trying to write the file.

Co-authored-by: Nick Hale <4175918+njhale@users.noreply.github.com>
Signed-off-by: Donnie Adams <donnie@acorn.io>

Author: thedadams

pkg/repos/get.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io/fs"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 	"sync"
@@ -132,6 +133,10 @@ func (m *Manager) deferredSetUpCredentialHelpers(ctx context.Context, cliCfg *co
 		return err
 	}
 
+	if err := os.MkdirAll(path.Dir(m.credHelperDirs.LastCheckedFile), 0755); err != nil {
+		return err
+	}
+
 	// Update the last-checked file.
 	if err := os.WriteFile(m.credHelperDirs.LastCheckedFile, []byte(now.Format(time.RFC3339)), 0644); err != nil {
 		return err