Initial authelia 4.39.20 package

- Base + service (native binary), container (rootless quadlet),
  postgresql and redis subpackages
- Fixed UID/GID 126 for the authelia user
- Rootless pod publishing 127.0.0.1:9091; db and redis join the pod
  (container) or publish on localhost (service)
- Container images pinned by digest
- Native -service subpackage built conditionally (--without service)

.gitignore

@@ -0,0 +1,3 @@
+# Downloaded upstream release tarballs
+authelia-v[0-9]*.[0-9]*.[0-9]*-linux-amd64.tar.gz
+authelia-v[0-9]*.[0-9]*.[0-9]*-linux-arm64.tar.gz