Add draft release checklist

.gitlab/issue_templates/Release checklist.md

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+## Release Checklist: vX.Y.Z
+
+This checklist tracks the process for releasing version **vX.Y.Z** of the OpenFlexure Microscope Server.
+
+---
+
+### Phase 1: Preparation (T-6 Weeks _minimum_)
+
+This phase focuses on planning the release and, crucially, getting any major infrastructure or build system changes merged *before* the feature freeze.
+
+* [ ] **Define Scope:** Create the `vX.Y.Z` milestone in GitLab and tag all intended feature MRs with it. Thisn is often done in a planning meeting with the core team.
+* [ ] **Schedule:** Set and announce the **Feature Freeze** and **Release Date**. Feature freeze should be at least 2 weeks before the release date.
+* [ ] **Build System:** Identify all required OS-level, build system, or OS customiser changes.
+* [ ] **Build System:** **Deadline:** All build system MRs must be merged and tested. (This should happen *as early as possible* in the cycle).
+
+---
+
+### Phase 2: Feature Freeze (T-2 Weeks)
+
+* [ ] **Announce:** Announce the Feature Freeze deadline one week out. This should be announced on the OpenFlexure Forum and in a message/email to the core team.
+* [ ] **Deadline:** **FEATURE FREEZE**. All feature MRs for the milestone must be merged.
+* [ ] **Branch:** Create a `release/vX.Y.Z` branch from `main`.
+    * *From this point, only bug fixes (regressions) are merged into this branch.*
+* [ ] **Communication:** Inform the team that all new feature work should target the *next* milestone.
+
+---
+
+### Phase 3: Testing & Qualification (T-1 Week)
+
+This phase is dedicated to intensive testing and bug fixing on the `release/vX.Y.Z` branch.
+
+* [ ] **Create Image:** Flash at least one SD card with the new image.
+* [ ] **Create Test Plan:** Document the specific tests to be run.
+* [ ] **Execute Test Plan:**
+    * [ ] HQ Camera Test
+    * [ ] High-Resolution Test
+    * [ ] Low-Resolution Test
+    * [ ] ROM Test
+    * [ ] Stitching Tests
+    * [ ] Test final image on all supported hardware revisions.
+    * [ ] Test functionality on the Microscope Simulator.
+* [ ] **Triage:** Triage all bugs found. Fix any release-blocking bugs.
+* [... ] **Repeat:** Re-build image and re-test as bugs are fixed. Update release date if absolutely necessary.
+
+---
+
+### Phase 4: Release Day (T-0)
+
+* [ ] **Final Version Bump:**
+    * [ ] **Server Package:** Update version number (add specific files).
+    * [ ] **Stitching Package:** Update version number (add specific files).
+    * [ ] Commit and merge the final version bumps into the `release/vX.Y.Z` branch.
+* [ ] **Final Build:** Generate the final, official release image from the `release/vX.Y.Z` branch.
+* [ ] **Draft Notes:** Draft the release notes and forum post.
+* [ ] **Merge:** Merge the `release/vX.Y.Z` branch into `main`.
+* [ ] **Tag:** Create a new Git tag on `main` (e.g., `vX.Y.Z`).
+* [ ] **Publish:**
+    * [ ] Push the tag to GitLab.
+    * [ ] Publish new versions of software sub-packages, such as openflexure-stitching, on PyPi.
+    * [ ] Create a new **GitLab Release** from the tag.
+    * [ ] Upload the final release image and other artifacts to the GitLab Release.
+    * [ ] Paste the release notes into the GitLab Release description.
+
+---
+
+### Phase 5: Post-Release
+
+* [ ] **Communicate:** Publish the release announcement on the OpenFlexure forum.
+* [ ] **Announce:** Share the forum post on other relevant channels (e.g., LinkedIn, Emailing Collaborators).
+* [ ] **Close:** Close this issue and the corresponding GitLab Milestone.
+* [ ] **Celebrate:** 🎉