Build separate debug image. Switch from kaniko to buildah.

Dockerfile.debug

@@ -0,0 +1,12 @@
+FROM embarkstudios/wireguard-ui AS latest
+
+FROM ubuntu
+RUN apt-get update -y && \
+    apt-get install -y software-properties-common iptables curl iproute2 ifupdown iputils-ping && \
+    echo resolvconf resolvconf/linkify-resolvconf boolean false | debconf-set-selections && \
+    echo "REPORT_ABSENT_SYMLINK=no" >> /etc/default/resolvconf && \
+    add-apt-repository --yes ppa:wireguard/wireguard && \
+    apt-get install resolvconf
+RUN apt-get install -qy --no-install-recommends wireguard-tools
+COPY --from=latest /wireguard-ui /
+ENTRYPOINT [ "/wireguard-ui" ]