Unify nightly releases: add changelog to all, remove firmware-specific nightly workflow

- Add mikepenz/release-changelog-builder-action to _deploy_nightly.yml
  so all three nightly releases (firmware, mechanical, electrical) get a changelog
- Switch firmware publish-nightly to use _deploy_nightly.yml with
  tag_name nightly-firmware to match mechanical/electrical naming
- Remove non-dated knot_esp32_nightly.uf2 duplicate from firmware build
- Delete _firmware_release_nightly.yml (no longer needed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: SukuWc

.github/workflows/_deploy_nightly.yml

@@ -45,6 +45,14 @@ jobs:
         with:
           path: download
 
+      - name: Build changelog
+        id: changelog
+        uses: mikepenz/release-changelog-builder-action@v5
+        with:
+          toTag: ${{ github.ref }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Create release
         uses: softprops/action-gh-release@v1
         with:
@@ -53,5 +61,6 @@ jobs:
           files: download/**/*
           draft: false
           prerelease: true
+          body: ${{ steps.changelog.outputs.changelog }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/_firmware_release_nightly.yml

@@ -79,15 +79,12 @@ jobs:
           ls
           cp binary/midi_host_fw.uf2 knot_esp32_release_${{ env.ACTION_DATE }}.uf2
           cp binary/midi_host_fw.uf2 knot_esp32_nightly_${{ env.ACTION_DATE }}.uf2
-          cp binary/midi_host_fw.uf2 knot_esp32_nightly.uf2
 
       - name: Upload nightly artifacts
         uses: actions/upload-artifact@v4
         with:
           name: nightly_firmware
-          path: |
-            knot_esp32_nightly_${{ env.ACTION_DATE }}.uf2
-            knot_esp32_nightly.uf2
+          path: knot_esp32_nightly_${{ env.ACTION_DATE }}.uf2
 
       - name: Upload release artifacts
         uses: actions/upload-artifact@v4
@@ -109,7 +106,8 @@ jobs:
     # Run on main branch OR when a tag exists to ensure nightly is never behind production releases
     needs: build
     if: always() && needs.build.result == 'success' && (github.ref == 'refs/heads/main' || needs.build.outputs.release_version != '')
-    uses: ./.github/workflows/_firmware_release_nightly.yml
+    uses: ./.github/workflows/_deploy_nightly.yml
     with:
-      product_name: "knot"
+      release_name: "Nightly Firmware"
+      tag_name: "nightly-firmware"
     secrets: inherit