Try to fix Dockerfile.

Dockerfile

@@ -48,7 +48,7 @@ RUN \
     # Description at https://releases.wekan.team/node.txt
     # SHA256SUM: 18c99d5e79e2fe91e75157a31be30e5420787213684d4048eb91e602e092725d
     wget https://releases.wekan.team/node-${NODE_VERSION}-${ARCHITECTURE}.tar.gz && \
-    echo "5e345fba54360bcdbaa0f8343ddd288b4fe6bbcc6f1a7257576814c39ef6a782  node-v8.11.1-linux-x64.tar.xz" >> SHASUMS256.txt.asc && \
+    echo "c85ed210a360c50d55baaf7b49419236e5241515ed21410d716f4c1f5deedb12  node-v8.11.1-linux-x64.tar.gz" >> SHASUMS256.txt.asc && \
     \
     # Verify nodejs authenticity
     grep ${NODE_VERSION}-${ARCHITECTURE}.tar.gz SHASUMS256.txt.asc | shasum -a 256 -c - && \