docker: Set XDG_DATA_HOME in tox image

To workaround a virtualenv 20 bug: <pypa/virtualenv#1640> Change-Id: I58dc7ce30399410910423fc1f6faf2b0993f7c56
wikimedia · Feb 15, 2020 · b525f2e · b525f2e
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diff --git a/dockerfiles/tox/Dockerfile.template b/dockerfiles/tox/Dockerfile.template
@@ -35,6 +35,8 @@ RUN {{ packages | apt_install }} \
     && rm -fR "$XDG_CACHE_HOME/pip"
 
 USER nobody
+# workaround https://github.com/pypa/virtualenv/issues/1640
+ENV XDG_DATA_HOME=/tmp
 WORKDIR /src
 ENTRYPOINT ["/run.sh"]
 COPY run.sh /run.sh
diff --git a/dockerfiles/tox/changelog b/dockerfiles/tox/changelog
@@ -1,3 +1,9 @@
+tox (0.4.3) wikimedia; urgency=medium
+
+  * Set XDG_DATA_HOME=/tmp to work around a virtualenv 20 issue.
+
+ -- Kunal Mehta <[email protected]>  Sat, 15 Feb 2020 15:41:49 -0800
+
 tox (0.4.2) wikimedia; urgency=medium
 
   * Install gettext for WMCZ Tracker (T241685)