sources: drop dnf stage

This source has been declared obsolete some time ago and is not
support anymore. We wont support it in the upcoming new manifest
format, therefore drop it now.

sources/org.osbuild.dnf

@@ -1,61 +0,0 @@
-#!/usr/bin/python3
-"""
-Download packages via dnf
-"""
-
-
-import json
-import sys
-
-
-SCHEMA = """
-"additionalProperties": true
-"""
-
-
-def main(options, sources, secrets):
-    repos = options.get("repos", {})
-    repo_secrets = secrets.get("repos", {})
-
-    reply = []
-    for checksum in sources:
-        try:
-            source_repo = repos[checksum]
-            source_repo_secrets = repo_secrets.get(checksum, {})
-        except KeyError:
-            json.dump({"error": f"source unknown: {checksum}"}, sys.stdout)
-            return 1
-
-        repo = {"checksum": checksum}
-
-        if "baseurl" in source_repo:
-            repo["baseurl"] = source_repo["baseurl"]
-        elif "mirrorlist" in source_repo:
-            repo["mirrorlist"] = source_repo["mirrorlist"]
-        elif "metalink" in source_repo:
-            repo["metalink"] = source_repo["metalink"]
-        else:
-            json.dump({"error": f"repo {checksum} is missing baseurl, mirrorlist, or metalink key"}, sys.stdout)
-
-        if "sslcacert" in source_repo:
-            repo["sslcacert"] = source_repo["sslcacert"]
-
-        if "gpgkey" in source_repo:
-            repo["gpgkey"] = source_repo["gpgkey"]
-
-        if "sslclientcert" in source_repo_secrets:
-            repo["sslclientcert"] = source_repo_secrets["sslclientcert"]
-
-        if "sslclientkey" in source_repo_secrets:
-            repo["sslclientkey"] = source_repo_secrets["sslclientkey"]
-
-        reply.append(repo)
-
-    json.dump(reply, sys.stdout)
-    return 0
-
-
-if __name__ == '__main__':
-    args = json.load(sys.stdin)
-    r = main(args["options"], args["checksums"], args.get("secrets", {}))
-    sys.exit(r)