ci: add missing CI files, refs NOISSUE

.gitea/PULL_REQUEST_TEMPLATE.md

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+### Summary :memo:
+_Write an overview about it._
+
+### Details
+_Describe more what you did on changes._
+1. (...)
+2. (...)
+
+### Bugfixes :bug: (delete if dind't have any)
+-
+
+### Checks
+- [ ] Closed #798
+- [ ] Tested Changes
+- [ ] Stakeholder Approval

.gitea/release_message.sh

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+#!/usr/bin/env bash
+previous_tag=$(git tag --sort=-creatordate | sed -n 2p)
+git shortlog "${previous_tag}.." | sed 's/^./    &/'