fix: Use a cached copy of OCDS when building a profile for merging, l…

…ike in libcoveocds, closes #351

process/processors/compiler.py

@@ -51,6 +51,8 @@ def compile_releases_by_ocdskit(collection, ocid, releases, extensions):
 
 @functools.lru_cache
 def _get_merger(extensions):
-    builder = ProfileBuilder(settings.COMPILER_OCDS_VERSION, extensions)
+    tag = settings.COMPILER_OCDS_VERSION
+    url = f"file://{settings.BASE_DIR / f'{tag}.zip'}"
+    builder = ProfileBuilder(tag, extensions, standard_base_url=url)
     patched_schema = builder.patched_release_schema()
     return ocdsmerge.Merger(patched_schema)