Add release notes

Closes-Bug: CLOUDOPS-761
Change-Id: If1aa57c0e1617a312f36e52c503a40b5ee166c91
(cherry picked from commit 7607e5a65486453e80b1a7a042051df61e672301)
diff --git a/tox.ini b/tox.ini
index d72d3ac..44a886c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -87,6 +87,7 @@
   -r{toxinidir}/doc/requirements.txt
 allowlist_externals =
   rm
+skip_install = true
 commands =
   rm -rf doc/build/html doc/build/doctrees
   sphinx-build -W --keep-going -b html -j auto doc/source doc/build/html
@@ -95,6 +96,7 @@
 envdir = {[testenv:docs]envdir}
 deps = {[testenv:docs]deps}
 allowlist_externals = {[testenv:docs]allowlist_externals}
+skip_install = {[testenv:docs]skip_install}
 commands =
   rm -rf doc/build/html doc/build/doctrees
   sphinx-autobuild doc/source doc/build/html
@@ -118,3 +120,10 @@
 [testenv:helm-unittest]
 commands =
   python3 {toxinidir}/hack/helm-unittest.py
+
+[testenv:generate-releasenotes]
+skip_install = true
+deps =
+  reno
+commands =
+  reno report --output {toxinidir}/CHANGELOG.rst