Stage: Schema migration to separated JSON files

In the past input schema for stages has been moved to standalone
JSON files. Looks like org.osbuild.tar was missed during the migration.

stages/org.osbuild.tar

@@ -1,105 +1,10 @@
 #!/usr/bin/python3
-"""
-Assembles the tree into a tar archive named `filename`.
-
-Uses the buildhost's `tar` command, like: `tar -cf $FILENAME -C $TREE`
-
-The compression of the tar archive if determined by the suffix, i.e.
-the `--auto-compress` option is used. See tar(1) for details.
-
-By default POSIX ACLs, SELinux contexts and extended attributes are included,
-in order to preserve the tree as closely as possible. It is possible to opt
-out of any of those by supplying the corresponding option.
-
-Buildhost commands used: `tar` and any needed compression program.
-"""
-
 import os
 import subprocess
 import sys
 
 import osbuild.api
 
-SCHEMA_2 = """
-"options": {
-  "additionalProperties": false,
-  "anyOf": [
-    {
-      "required": ["root-node"],
-      "not": {
-        "required": ["paths"]
-      }
-    },
-    {
-      "required": ["paths"],
-      "not": {
-        "required": ["root-node"]
-      }
-    },
-    {
-      "not": {
-        "required": ["paths", "root-node"]
-      }
-    }
-  ],
-  "required": ["filename"],
-  "properties": {
-    "filename": {
-      "description": "Filename for tar archive",
-      "type": "string"
-    },
-    "format": {
-      "description": "Archive format to use",
-      "type": "string",
-      "enum": ["gnu", "oldgnu", "posix", "ustar", "v7"],
-      "default": "gnu"
-    },
-    "acls": {
-      "description": "Enable support for POSIX ACLs",
-       "type": "boolean",
-       "default": true
-    },
-    "selinux": {
-      "description": "Enable support for SELinux contexts",
-      "type": "boolean",
-      "default": true
-    },
-    "xattrs": {
-      "description": "Enable support for extended attributes",
-      "type": "boolean",
-      "default": true
-    },
-    "root-node": {
-      "description": "How to handle the root node: include or omit, mutually exclusive with paths",
-      "enum": ["include", "omit"]
-    },
-    "paths": {
-      "type": "array",
-      "items": {
-        "type": "string",
-        "description": "If specified, the archive will only contain the specified paths, in the specified order"
-      }
-    },
-    "sparse": {
-      "description": "Make archive files sparse",
-      "type": "boolean",
-      "default": false
-    }
-  }
-},
-"inputs": {
-  "type": "object",
-  "additionalProperties": false,
-  "required": ["tree"],
-  "properties": {
-    "tree": {
-      "type": "object",
-      "additionalProperties": true
-    }
-  }
-}
-"""
-
 
 def main(inputs, output_dir, options):
     tree = inputs["tree"]["path"]