Add in docs steps for release a Dockerfile item
@@ -61,6 +61,7 @@ Steps to prepare for the release (e.g. a week before) to check that things are i
Links are at https://github.com/gammapy/gammapy#status-shields
#. Check that the changelog is complete, by going through the list of Github issues for the
release milestone.
+#. Update MyBinder Dockerfile changing the Gammapy release number in three different lines.
Make release
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