diff --git a/Dockerfile b/Dockerfile
index fcfd7c5..8d9cee7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,12 @@ FROM docker.gitea.com/runner-images:ubuntu-latest-slim
 
 # Install Nix as a multi-user installation
 RUN curl -L https://nixos.org/nix/install | sh -s -- --daemon
-ENV PATH="/nix/var/nix/profiles/default/bin:$PATH"
+
+# 2. Set the environment variables globally for all following RUN commands
+ENV USER=root
+ENV PATH="/nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin"
+ENV NIX_SSL_CERT_FILE="/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
+ENV NIX_PATH="/nix/var/nix/profiles/per-user/root/channels"
 
 # Enable flakes and nix-command
 RUN mkdir -p /etc/nix && \