fixed entrypoint and using tumbleweed version instead of restic verson as tag

Dockerfile

@@ -1,10 +1,13 @@
-FROM registry.opensuse.org/opensuse/tumbleweed:latest
-
 ARG VERSION
+FROM registry.opensuse.org/opensuse/tumbleweed:${VERSION}
+
 
 RUN zypper --non-interactive install \
   openssh-clients \
-  restic-${VERSION} \
+  restic \
   && zypper clean -a
-ADD entrypoint.sh /usr/local/bin/entrypoint.sh
+
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
 ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+CMD ["start"]