Derive render Java version from Minecraft

build/scripts/resolve_latest_minecraft_release.py

@@ -15,8 +15,17 @@ def main() -> int:
     latest_release = manifest["latest"]["release"]
     latest_snapshot = manifest["latest"]["snapshot"]
 
+    latest_release_entry = next(version for version in manifest["versions"] if version["id"] == latest_release)
+    with urlopen(latest_release_entry["url"], timeout=30) as response:
+        version_metadata = json.load(response)
+
+    java_version = version_metadata.get("javaVersion", {}).get("majorVersion")
+    if not isinstance(java_version, int):
+        raise RuntimeError(f"Latest Minecraft release {latest_release} does not declare a javaVersion.majorVersion")
+
     print(latest_release)
     print(f"snapshot={latest_snapshot}")
+    print(f"java_version={java_version}")
     return 0