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.

.gitignore

@@ -0,0 +1,3 @@
+# Downloaded upstream release tarballs (spectool -g semaphore.spec)
+semaphore_community_*_linux_amd64.tar.gz
+semaphore_community_*_linux_arm64.tar.gz