Try newer build strategy

containerfiles/Containerfile-XOR

@@ -1,6 +1,6 @@
 FROM ghcr.io/allanger/dumb-downloader as dudo
-ENV OPENVPN_VERSION=2.6.9
-ENV TUNNELBLICK_VERSION=4.0.0beta15
+ARG OPENVPN_VERSION
+ARG TUNNELBLICK_VERSION
 RUN apt update && apt install gnupg tar -y
 RUN mkdir /output
 # ------------------------------------------------------
@@ -27,8 +27,8 @@ FROM ubuntu as builder
 # ------------------------------------------------------
 # -- TODO: Define it only once
 # ------------------------------------------------------
-ENV OPENVPN_VERSION=2.6.9
-ENV TUNNELBLICK_VERSION=v4.0.0beta15
+ARG OPENVPN_VERSION
+ARG TUNNELBLICK_VERSION
 COPY --from=dudo /output /src
 RUN apt-get update &&\
       apt-get install -y wget tar unzip build-essential \