Initial semaphore 2.19.8 package with service, container and postgresql subpackages

Semaphore UI packaged from the upstream community (MIT) release
binaries, following the gitea packaging pattern: native systemd service
and Podman quadlet variants (mutually exclusive), with an optional
PostgreSQL backend via quadlet drop-ins. SQLite is the default
database; session/encryption secrets are generated into
/etc/semaphore/env on first install.

config.json

@@ -0,0 +1,8 @@
+{
+	"dialect": "sqlite",
+	"sqlite": {
+		"host": "/var/lib/semaphore/database.sqlite"
+	},
+	"port": ":3000",
+	"tmp_path": "/var/lib/semaphore/tmp"
+}