Include a changelog file which will be part of the release body when …

…GitHub workflow is triggered. Add-on SHA256 sum will always be printed at the end of the file

.github/workflows/build_addon.yml

@@ -55,10 +55,13 @@ jobs:
       uses: actions/download-artifact@v3
     - name: Display structure of downloaded files
       run: ls -R
+    - name: Calculate sha256
+      run: sha256sum packaged_addon/*.nvda-addon >> changelog.md
 
     - name: Release
       uses: softprops/action-gh-release@v1
       with:
         files: packaged_addon/*.nvda-addon
+        body_path: changelog.md
         fail_on_unmatched_files: true
         prerelease: ${{ contains(github.ref, '-') }}

changelog.md

@@ -0,0 +1,5 @@
+Use this file to explain what has changed in your add-on since the previous release. This will be included automatically in the release description when used with GitHub actions.
+
+Don't modify the following line, unless you also remove SHA256 sum calculation from the workflow. This line must be the last one in the file.
+
+SHA256: