feat(installerconf): github_source packages include git_url for clone fallback

git_url is now a standalone field that can appear alongside any source
type. For githubsource packages, it adds a git clone entry per release
in addition to the tarball and zipball. Updated aliasman, duckdns.sh,
and serviceman configs.

aliasman/releases.conf

@@ -1 +1,2 @@
 github_source = BeyondCodeBootcamp/aliasman
+git_url = https://github.com/BeyondCodeBootcamp/aliasman.git

duckdns.sh/releases.conf

@@ -1 +1,2 @@
 github_source = BeyondCodeBootcamp/DuckDNS.sh
+git_url = https://github.com/BeyondCodeBootcamp/DuckDNS.sh.git

internal/classifypkg/classifypkg.go

@@ -445,6 +445,16 @@ func classifyGitHubSource(pkg string, conf *installerconf.Conf, d *rawcache.Dir)
 				Date:     date,
 			})
 		}
+		if conf.GitURL != "" {
+			assets = append(assets, storage.Asset{
+				Filename: repo + "-" + tag,
+				Version:  version,
+				Channel:  channel,
+				Format:   "git",
+				Download: conf.GitURL,
+				Date:     date,
+			})
+		}
 	}
 	return assets, nil
 }

internal/installerconf/installerconf.go

@@ -74,6 +74,11 @@ type Conf struct {
 	// (e.g. a Gitea instance or nodedist index URL).
 	BaseURL string
 
+	// GitURL is the git clone URL for source-installable packages.
+	// Present alongside github_source/gitea_source to provide a
+	// git clone fallback in addition to release tarballs.
+	GitURL string
+
 	// TagPrefix filters releases in monorepos. Only tags starting with
 	// this prefix are included, and the prefix is stripped from the
 	// version string. Example: "tools/monorel/"
@@ -160,6 +165,11 @@ func Read(path string) (*Conf, error) {
 		c.BaseURL = raw["url"]
 	}
 
+	// git_url can appear alongside any source type (e.g. github_source)
+	// to provide a git clone fallback. When it's the only key, it's the
+	// primary source (gittag).
+	c.GitURL = raw["git_url"]
+
 	c.TagPrefix = raw["tag_prefix"]
 
 	if v := raw["version_prefixes"]; v != "" {

serviceman/releases.conf

@@ -1 +1,2 @@
 github_source = bnnanet/serviceman
+git_url = https://github.com/bnnanet/serviceman.git