release template (#6501)

.github/release_template.md

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+### Template
+[Release Template](https://github.com/owncloud/ocis/blob/master/.github/release_template.md)
+
+### Prerequisites
+
+* [ ] DEV/QA: Kickoff meeting [Kickoff meeting] (https://confluence.owncloud.com/display/QA/Technical+release+3.0.0+Overview)
+* [ ] DEV/QA: Define client versions and provide a list of new features  
+* [ ] DEV: Create branch `release-x.x.x-rc.x` -> CODEFREEZE
+  * [ ] DEV: bump ocis version in necessary files
+  * [ ] DEV: `changelog/CHANGELOG.tmpl`
+  * [ ] DEV: `ocis-pkg/version/version.go`
+  * [ ] DEV: `sonar-project.properties` 
+  * [ ] DEV: prepare changelog folder in `changelog/x.x.x_????_??_??`
+* [ ] DEV: Check successful CI run on release branch
+* [ ] DEV: Create signed tag `vx.y.z-rc.x`
+* [ ] DEV: Check successful CI run on `vx.y.z-rc.x` tag / BLOCKING for all further activity
+* [ ] DEV: Merge back release branch
+* [ ] DEV: bump released deployments to `vx.y.z-rc.x`
+* [ ] DEV: update `ocis.released.owncloud.works`
+* [ ] DEV: https://ocis.team.owncloud.works/
+  * [ ] DEV: needs snapshot and migration
+
+### QA Phase
+
+* [ ] QA: Confirmatory testing (if needed)
+* [ ] QA: [Compatibility test](https://github.com/owncloud/QA/blob/master/Server/Test_Plan_OCIS_Compatibility_Test.md)
+* [ ] QA: [Performance test](https://github.com/owncloud/cdperf/tree/main/packages/k6-tests/src)
+* [ ] QA: Documentation test:
+  * [ ] QA: Single binary - setup
+  * [ ] QA: Docker - setup
+  * [ ] QA: Docker-compose - setup
+  * [ ] QA: helm/k8s - setup
+* [ ] QA: e2e with different deployment:
+  * [ ] QA: [wopi](ocis.ocis-wopi.released.owncloud.works) 
+  * [ ] QA: [traefik](ocis.ocis-traefik.released.owncloud.works)
+  * [ ] QA: [ldap](ocis.ocis-ldap.released.owncloud.works)
+* [ ] QA: e2e with different storage:
+  * [ ] QA: local
+  * [ ] QA: nfs
+  * [ ] QA: s3
+* [ ] QA: Different clients:
+  * [ ] QA: desktop (define version) https://github.com/owncloud/client/releases
+    * [ ] QA: against mac - smoke test
+    * [ ] QA: against windows - smoke test
+    * [ ] QA: against linux (use auto tests)
+  * [ ] QA: android (define version) https://github.com/owncloud/android/releases
+  * [ ] QA: ios (define version)
+* [ ] QA: [Smoke test](https://github.com/owncloud/QA/blob/master/Server/Test_Plan_OCIS_Smoke_Web_Office_Test.md) on Web Office (Collabora, Onlyoffice, Microsoft office)
+* [ ] QA: Smoke test Hello extension
+* [ ] QA: [Smoke test](https://github.com/owncloud/QA/blob/master/Server/Test_Plan_OCIS_Smoke_Ldap_Test.md) ldap
+* [ ] QA: Collecting errors found
+
+### After QA Phase
+
+* [ ] Brief company-wide heads up via mail @tbsbdr
+* [ ] DEV: Create branch `release-x.x.x`
+  * [ ] DEV: bump ocis version in necessary files
+  * [ ] DEV: `ocis-pkg/version/version.go`
+  * [ ] DEV: `sonar-project.properties`
+  * [ ] DEV: released deployment versions
+  * [ ] DEV: prepare changelog folder in `changelog/x.x.x_???`
+* [ ] Release Notes + Breaking Changes @tbsbdr
+* [ ] Migration + Breaking Changes Admin Doc @mmattel
+* [ ] Migration + Breaking Changes Helm Chart Doc @wkloucek @mmattel
+* [ ] DEV: Create final signed tag
+* [ ] DEV: Check successful CI run on `vx.y.z` tag / BLOCKING for all further activity
+* [ ] Merge release notes 
+
+### Post-release communication
+* [ ] DEV: Create a `docs-stable-x.y` branch based on the docs folder in the ocis repo @micbar 
+* [ ] DEV: Create a `x.y.z` release in the ocis-helm repo (frozen state) @wkloucek
+* [ ] DEV/QA: Ping documentation in RC about the new release tag (for ocis/helm chart version bump in docs)
+* [ ] DEV/QA: Ping marketing to update all download links (download mirrors are updated at the full hour, wait with ping until download is actually available)
+* [ ] DEV/QA: Ping @hodyroff once the demo instances are running this release
+* [ ] DEV/QA: notify @michaelstingl @hosy @fmoc @jesmrec to publish client finals
+* [ ] DEV: Merge back release branch
+* [ ] DEV: Create stable-x.y branch in the ocis repo from final tag