chore: creating prepare_release template (#2225)

.github/ISSUE_TEMPLATE/prepare_release.md

@@ -0,0 +1,27 @@
+---
+name: Prepare release
+about: Execute tasks for the creation and publishing of a new release
+title: 'Prepare release 0.0.0'
+labels: release
+assignees: ''
+
+---
+
+<!--
+Add appropriate release number to title!
+
+For detailed info on the release process refer to https://github.com/waku-org/nwaku/blob/master/docs/contributors/release-process.md
+ -->
+
+### Items to complete
+- [ ] create release branch
+- [ ] assign release candidate tag
+- [ ] validate release candidate
+- [ ] generate and edit releases notes
+- [ ] open PR and merge release notes to master
+- [ ] cherry-pick release notes to the release branch
+- [ ] assign release tag to the cherry-picked release notes commit
+- [ ] create GitHub release
+- [ ] deploy the release to DockerHub
+- [ ] deploy release to `wakuv2.prod` fleet
+- [ ] announce the release