test/koji: move the koji test to schutzbot

The Koji test in Github actions was always a bit quick and dirty solution.
I think it's much nicer solution to run it on Schutzbot.

Therefore, this commit moves the koji_test.go to a new osbuild-koji-tests
executable. This new test isn't run in the base test suite as one would
anticipate but inside the koji.sh test. This is needed because
osbuild-koji-tests requires a running koji instance. This might change
in the future but I think it works for now.

test/data/koji/koji.conf

@@ -0,0 +1,70 @@
+; Koji default config file taken from Fedora 32 with added custom
+; serverca value.
+[koji]
+
+;configuration for koji cli tool
+
+;url of XMLRPC server
+;server = http://hub.example.com/kojihub
+server = https://koji.fedoraproject.org/kojihub
+
+;url of web interface
+;weburl = http://www.example.com/koji
+weburl = https://koji.fedoraproject.org/koji
+
+;url of package download site
+;pkgurl = http://www.example.com/packages
+
+;path to the koji top directory
+;topdir = /mnt/koji
+topurl = https://kojipkgs.fedoraproject.org/
+
+;configuration for Kerberos authentication
+authtype = kerberos
+krb_rdns = false
+
+;the service name of the principal being used by the hub
+;krbservice = host
+
+;the principal to auth as for automated clients
+;principal = client@EXAMPLE.COM
+
+;the keytab to auth as for automated clients
+;keytab = /etc/krb5.keytab
+
+;enable to lookup dns canonical hostname for krb auth
+;krb_canon_host = no
+
+;The realm of server principal. Using client's realm if not set
+;krb_server_realm = EXAMPLE.COM
+
+
+;configuration for SSL authentication
+
+;client certificate
+;cert = ~/.koji/client.crt
+
+;certificate of the CA that issued the HTTP server certificate
+;serverca = ~/.koji/serverca.crt
+
+;plugin paths, separated by ':' as the same as the shell's PATH
+;koji_cli_plugins module and ~/.koji/plugins are always loaded in advance,
+;and then be overridden by this option
+;plugin_paths = ~/.koji/plugins
+
+;[not_implemented_yet]
+;enabled plugins for CLI, runroot and save_failed_tree are available
+;plugins =
+; runroot plugin is enabled by default in fedora
+plugins = runroot
+
+;timeout of XMLRPC requests by seconds, default: 60 * 60 * 12 = 43200
+;timeout = 43200
+
+;timeout of GSSAPI/SSL authentication by seconds, default: 60
+;auth_timeout = 60
+
+; use the fast upload feature of koji by default
+use_fast_upload = yes
+
+serverca = /tmp/osbuild-composer-koji-test/ca-crt.pem