Externalize sync targets from hardcoded constants to env/config

- Added SyncTargets and SyncRemoteDir to internal/config.Config.
- Replaced the package-level syncTargets and syncRemoteDir constants in
  cmd/snonux/sync.go with default values, populated lazily via
  resolveSyncConfig().
- Accept --sync-targets and --sync-remote-dir CLI flags; fall back to
  SNONUX_SYNC_TARGETS and SNONUX_SYNC_REMOTE_DIR env vars; then fall back
  to the previous hardcoded defaults (pi0/pi1, /var/www/html/snonux/).

1 files changed, 10 insertions, 1 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index f52b445..f310a6f 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -24,6 +24,15 @@ type Config struct {
 	// Defaults to "neon". Run with --help to see all available themes.
 	Theme string
 
-	// Sync, when true, rsyncs OutputDir to fixed mirror hosts after a successful run.
+	// Sync, when true, rsyncs OutputDir to mirror hosts after a successful run.
 	Sync bool
+
+	// SyncTargets are the remote hostnames to rsync to when Sync is true.
+	// Defaults to ["pi0.lan.buetow.org", "pi1.lan.buetow.org"].
+	// Override with SNONUX_SYNC_TARGETS env var (comma-separated).
+	SyncTargets []string
+
+	// SyncRemoteDir is the destination directory on each target host.
+	// Defaults to "/var/www/html/snonux/". Override with SNONUX_SYNC_REMOTE_DIR env var.
+	SyncRemoteDir string
 }