enhance!: match valid_volumes with bmatcuk/doublestar (#1214)

`valid_volumes` patterns now match with doublestar instead of gobwas/glob, which was compiled without separators so `*` crossed slashes. doublestar is already in the module graph, keeps `*` within one path segment and matches host paths with the OS separator, which fixes Windows patterns where a backslash was read as an escape.

Breaking: a host pattern that relied on `*` matching nested paths needs `**`, e.g. `/data/**` instead of `/data/*`. Named volumes and the bare `**` are unaffected.
Co-authored-by: bircni <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1214
Reviewed-by: bircni <[email protected]>
Co-authored-by: silverwind <[email protected]>

internal/pkg/config/config.example.yaml

@@ -232,7 +232,8 @@ container:
   # If it's empty, /workspace will be used.
   # Purely numeric subdirectories under this path are reserved for task workspaces and may be removed by idle cleanup.
   #workdir_parent:
-  # Volumes (including bind mounts) can be mounted to containers. Glob syntax is supported, see https://github.com/gobwas/glob
+  # Volumes (including bind mounts) can be mounted to containers. Glob syntax is supported, see https://github.com/bmatcuk/doublestar#patterns
+  # `*` matches within a single path segment, `**` also matches across path separators.
   # You can specify multiple volumes. If the sequence is empty, no volumes can be mounted.
   # For example, if you only allow containers to mount the `data` volume and all the json files in `/src`, you should change the config to:
   # valid_volumes: