CI: Build pre-release artifacts in GhA on merge to release branches and main. (#106779)

* Add grafana-build action and workflow

* Fix the --verify flag stalling on tar.gz builds

* Add event sources for main / release branches

* Update CODEOWNERS

pkg/build/daggerbuild/containers/with_embedded_fs.go

@@ -1,39 +1 @@
 package containers
-
-import (
-	"embed"
-	"io/fs"
-	"path/filepath"
-
-	"dagger.io/dagger"
-)
-
-func WithEmbeddedFS(client *dagger.Client, c *dagger.Container, path string, e embed.FS) (*dagger.Container, error) {
-	dir := client.Directory()
-
-	err := fs.WalkDir(e, ".", func(path string, entry fs.DirEntry, err error) error {
-		if entry.IsDir() {
-			return nil
-		}
-		if err != nil {
-			return err
-		}
-
-		content, err := e.ReadFile(path)
-		if err != nil {
-			return err
-		}
-		rel, err := filepath.Rel("scripts/packaging/windows", path)
-		if err != nil {
-			return err
-		}
-
-		dir = dir.WithNewFile(rel, string(content))
-		return nil
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	return c.WithDirectory(path, dir), nil
-}