fix: Void Dockerfile — wipe repos, use --repository only

Author: porus

tests/docker/Dockerfile.void

@@ -1,9 +1,11 @@
 FROM voidlinux/voidlinux:latest
 
-# GitHub Actions: default repos point to broken mirror.
-# Use --repository flag to bypass repo configs entirely.
-RUN xbps-install -Sy --repository=https://repo-default.voidlinux.org/current \
-    base-devel curl git cmake nodejs python3 cargo bash \
+# GitHub Actions: image has broken default repos.
+# Wipe config entirely, use --repository flag only.
+RUN rm -rf /usr/share/xbps.d \
+    && mkdir -p /usr/share/xbps.d \
+    && xbps-install -Sy --repository=https://repo-default.voidlinux.org/current \
+        base-devel curl git cmake nodejs python3 cargo bash \
     && rm -rf /var/cache/xbps/*
 
 CMD ["/bin/bash"]