Create release.md

.github/ISSUE_TEMPLATE/release.md

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+---
+name: Rlease task
+about: Create a release task
+title: "[RELEASE]"
+labels: release/task
+assignees: ''
+
+---
+
+**What's the task? Please describe.**
+Action items for releasing vx.y.z
+
+**Describe the items of the task (DoD, definition of done) you'd like.**
+  - Pre-Release
+    - [ ] Regression test plan (manual) - @khushboo-rancher 
+    - [ ] Run e2e regression for pre-GA milestones (`install`, `upgrade`) - @yangchiu 
+    - [ ] Run security testing of container images for pre-GA milestones - @yangchiu 
+    - [ ] Verify longhorn chart PR to ensure all artifacts are ready for GA (`install`, `upgrade`)  @chriscchien 
+    - [ ] Run core testing (install, upgrade) for GA build from the previous patch and the last patch of the previous feature release (1.4.2). - @yangchiu 
+  - Release
+    - [ ] Release longhorn/chart from the release branch to publish to ArtifactHub
+    - [ ] Release note
+	     - [ ] Deprecation note
+	     - [ ] Upgrade notes including highlighted notes, deprecation, compatible changes, and others impacting the current users
+  - Post-Release
+    - [ ] Create a new release branch of manager/ui/tests/engine/longhorn instance-manager/share-manager/backing-image-manager when creating the RC1
+    - [ ] Update https://github.com/longhorn/longhorn/blob/master/deploy/upgrade_responder_server/chart-values.yaml @PhanLe1010 
+    - [ ] Add another request for the rancher charts for the next patch release (`1.5.1`) @rebeccazzzz  
+  - Rancher charts: verify the chart is able to install & upgrade - @khushboo-rancher 
+    - [ ] rancher/image-mirrors update @weizhe0422 (@PhanLe1010 )
+        - https://github.com/rancher/image-mirror/pull/412
+    - [ ] rancher/charts 2.7 branches for rancher marketplace @weizhe0422 (@PhanLe1010)
+        - `dev-2.7`: https://github.com/rancher/charts/pull/2766
+
+cc @longhorn/qa @longhorn/dev