Remove dead code

Verified with

```
deadcode -test ./...
```

Followed-up with a lint check.

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/oci/cache.go

@@ -1,111 +0,0 @@
-package oci
-
-import (
-	"context"
-	"fmt"
-	"os"
-	"path/filepath"
-
-	"github.com/containers/image/v5/types"
-)
-
-type CacheOpt func(*Cache) error
-
-func OptSetCachePath(path string) CacheOpt {
-	return func(s *Cache) error {
-		s.path = path
-		return nil
-	}
-}
-
-type Cache struct {
-	path string
-}
-
-func (c *Cache) rootfsDir() string {
-	return filepath.Join(c.path, rootfsPrefix)
-}
-
-func (c *Cache) blobDir() string {
-	return filepath.Join(c.path, blobPrefix)
-}
-
-// checkEntry maps the given id a path within the cache. It will return an os.ErrNotExist if the entry path is empty.
-func (c *Cache) checkEntry(id string) (string, error) {
-	path := filepath.Join(c.rootfsDir(), id)
-	fi, err := os.Stat(path)
-	if err != nil {
-		return "", err
-	}
-
-	if !fi.IsDir() {
-		return "", fmt.Errorf("invalid entry %q is not a directory", path)
-	}
-
-	return path, nil
-}
-
-func (c *Cache) createEntry(id string) (string, error) {
-	path := filepath.Join(c.rootfsDir(), id)
-	if err := os.MkdirAll(path, 0755); err != nil {
-		return "", err
-	}
-
-	return path, nil
-}
-
-func NewCache(opts ...CacheOpt) (*Cache, error) {
-	s := &Cache{
-		path: filepath.Join(defaultCachePath),
-	}
-
-	for _, o := range opts {
-		if err := o(s); err != nil {
-			return nil, err
-		}
-	}
-
-	if err := os.MkdirAll(s.path, 0755); err != nil {
-		return nil, err
-	}
-
-	return s, nil
-}
-
-func (c *Cache) Pull(ctx context.Context, uri string, sysCtx *types.SystemContext) (string, error) {
-	p, err := NewPuller(
-		OptSetBlobCachePath(c.blobDir()),
-		OptSetSystemContext(sysCtx),
-	)
-	if err != nil {
-		return "", err
-	}
-
-	id, err := p.GenerateID(ctx, uri)
-	if err != nil {
-		return "", err
-	}
-
-	// look up cache entry and return if it exists
-	path, err := c.checkEntry(id)
-	if err == nil {
-		return path, nil
-	} else if !os.IsNotExist(err) {
-		return "", err
-	}
-
-	// cache entry does not exist so we must create it
-	path, err = c.createEntry(id)
-	if err != nil {
-		return "", err
-	}
-
-	// populate entry
-	if err := p.Pull(ctx, uri, path); err != nil {
-		// clean up entry on error
-		os.RemoveAll(path)
-		return "", err
-	}
-
-	return path, nil
-}

internal/pkg/oci/puller.go

@@ -31,13 +31,6 @@ func OptSetBlobCachePath(path string) pullerOpt {
 	}
 }
 
-func OptSetTmpDirPath(path string) pullerOpt {
-	return func(p *puller) error {
-		p.tmpDirPath = path
-		return nil
-	}
-}
-
 func OptSetSystemContext(s *types.SystemContext) pullerOpt {
 	return func(p *puller) error {
 		p.sysCtx = s