feat!: add cache service v2, add toolkit patches (#1110)

Serves `github.actions.results.api.v1.CacheService` next to the v1 cache API, sharing its store, plus the subset of the Azure blob protocol the toolkit uploads with. On by default via `cache.v2`, and works with `external_server`.

Clients reach it through two edits in the action's own bundle: the GHES check is opened, and the cache service URL is taken from `ACTIONS_CACHE_URL`.

The same GHES check is what makes the stock `actions/upload-artifact` and `download-artifact` abort on Gitea. Opening it makes them work without the `gitea-upload-artifact` fork, from `upload-artifact@v4.4.0` on.

Verified against 118 real bundles, every major version of 16 actions: 92 patched, the rest deliberately left alone, and every patched bundle checked with `node --check`. Also end to end against pinned `actions/cache@v6.1.0` with an unreachable results URL, so only the patch can make the cache work.

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: bircni <me@silverwind.io>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1110
Reviewed-by: silverwind <2021+silverwind@noreply.gitea.com>

internal/pkg/config/config_test.go

@@ -347,3 +347,13 @@ cache:
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "contains no secret")
 }
+
+// The shipped example must parse, and every key in it must be one the config knows.
+func TestLoadDefault_ExampleConfigParses(t *testing.T) {
+	hook := test.NewGlobal()
+	defer hook.Reset()
+
+	_, err := LoadDefault("config.example.yaml")
+	require.NoError(t, err)
+	assert.Empty(t, hook.AllEntries())
+}