feat: update settings move under updates, with an interval

updates.autoCheck (was updateCheck) and updates.updateSources (was
releases) sit together with updates.autoCheckInterval, a duration (24h
by default) for how often lazysecrets looks for a newer release on its
own.

internal/config/config_test.go

@@ -70,8 +70,9 @@ func TestLoadRejectsMistakes(t *testing.T) {
 		"old layout": "azure:\n  vaults: [https://kv.vault.azure.net/]\n",
 		"duration":   "timeout: soon\n",
 		"view":       "sourcesView: tree\n",
-		"releases":   "releases: [git.example.com/team/lazysecrets]\n",
-		"http":       "releases: [http://git.example.com/team/lazysecrets]\n",
+		"sources":    "updates:\n  updateSources: [git.example.com/team/lazysecrets]\n",
+		"http":       "updates:\n  updateSources: [http://git.example.com/team/lazysecrets]\n",
+		"interval":   "updates:\n  autoCheckInterval: 0s\n",
 		"share key":  "share:\n  key: https://kv.vault.azure.net/\n",
 		"workspace":  "share:\n  key: \"{{secrets/team/env-share}}\"\n",
 		"short keys": "share:\n  keyRules:\n    minLength: 8\n",
@@ -119,10 +120,10 @@ theme:
 	}
 }
 
-func TestReleases(t *testing.T) {
-	c, err := Load(write(t, "releases: [https://git.example.com/team/lazysecrets]\n"))
-	if err != nil || len(c.Releases) != 1 {
-		t.Errorf("releases = %v, %v", c.Releases, err)
+func TestUpdates(t *testing.T) {
+	c, err := Load(write(t, "updates:\n  autoCheck: false\n  autoCheckInterval: 168h\n  updateSources: [https://git.example.com/team/lazysecrets]\n"))
+	if err != nil || On(c.Updates.AutoCheck) || *c.Updates.AutoCheckInterval != 7*24*time.Hour || len(c.Updates.UpdateSources) != 1 {
+		t.Errorf("updates = %+v, %v", c.Updates, err)
 	}
 }