roling release template

.github/rolling_release_template.md

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+### Rolling release template
+[Release Template](https://github.com/opencloud-eu/opencloud/blob/main/.github/rolling_release_template.md)
+
+## Prerequisites
+* [ ] web release
+  * [ ] bump web version
+  * [ ] squash and merge the web release PR
+  * [ ] bump web v.x.y.z in opencloud
+
+* [ ] reva release
+  * [ ] squash and merge the reva Release PR
+  * [ ] bump reva and update opencloud version in `pkg/version.go`
+
+## QA Phase
+* [ ] bump `opencloud_commitid` in web and run all working tests in CI
+* [ ] compatibility test
+* [ ] n8n integration QA
+* [ ] confirmatory testing, if needed
+
+## Collected bugs
+
+## After QA Phase
+* [ ] replace `%%NEXT%%` wuth the release version
+* [ ] squash and merge Release PR
+* [ ] publish release notes to the docs
+* [ ] add migration guide to changelog with prefix `**ACTION REQUIRED:**`, if needed.  
+* [ ] add release notes from web and reva to opencloud changelog
+* [ ] update the public matrix channel topic
+* [ ] update https://update.opencloud.eu/server.json
+* [ ] update the version on demo.opencloud.eu