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.go

@@ -38,14 +38,8 @@ type Config struct {
 	SourcesView string `yaml:"sourcesView"`
 	// History counts uses of items for the Recent list; defaults to true.
 	History *bool `yaml:"history"`
-	// UpdateCheck looks for a newer release once a day, in the
-	// background; defaults to true. U and lazysecrets update work either
-	// way.
-	UpdateCheck *bool `yaml:"updateCheck"`
-	// Releases are the repositories updates come from, tried in order:
-	// on GitHub, or a Gitea or Forgejo server. Defaults to GitHub, then
-	// git.kebcloud.no (update.DefaultServers).
-	Releases []string `yaml:"releases"`
+	// Updates sets how lazysecrets looks for newer releases.
+	Updates Updates `yaml:"updates"`
 	// Cache keeps what was loaded (never values) between runs, so lists
 	// show at once and refresh in the background; defaults to true.
 	Cache *bool `yaml:"cache"`
@@ -68,6 +62,19 @@ type Config struct {
 	Theme map[string][]string `yaml:"theme"`
 }
 
+type Updates struct {
+	// AutoCheck looks for a newer release in the background at startup,
+	// at most once per AutoCheckInterval; defaults to true. U and
+	// lazysecrets update work either way.
+	AutoCheck *bool `yaml:"autoCheck"`
+	// AutoCheckInterval defaults to 24h.
+	AutoCheckInterval *time.Duration `yaml:"autoCheckInterval"`
+	// UpdateSources are the repositories updates come from, tried in
+	// order: on GitHub, or a Gitea or Forgejo server. Defaults to GitHub,
+	// then git.kebcloud.no (update.DefaultServers).
+	UpdateSources []string `yaml:"updateSources"`
+}
+
 type LinkHandler struct {
 	// Terminal to open links in, overriding the one handler install
 	// detected: kitty, ghostty, wezterm, iterm2, terminal, alacritty,
@@ -236,9 +243,12 @@ func (c Config) validate(path string) error {
 	if d := c.LoadDelay; d != nil && (*d < 0 || *d > 5*time.Second) {
 		return fmt.Errorf("%s: loadDelay: %s is not between 0s and 5s", path, *d)
 	}
-	for i, r := range c.Releases {
+	if d := c.Updates.AutoCheckInterval; d != nil && *d <= 0 {
+		return fmt.Errorf("%s: updates.autoCheckInterval: %s is not positive (autoCheck: false turns it off)", path, *d)
+	}
+	for i, r := range c.Updates.UpdateSources {
 		if _, err := update.API(r); err != nil || !strings.HasPrefix(r, "https://") {
-			return fmt.Errorf("%s: releases[%d]: %q is not an https:// repository address, like %s", path, i, r, update.GitHubRepo)
+			return fmt.Errorf("%s: updates.updateSources[%d]: %q is not an https:// repository address, like %s", path, i, r, update.GitHubRepo)
 		}
 	}
 	if k := c.Share.Key; k != "" {