ci: automate release notes generation using git log

.gitea/workflows/build.yml

@@ -93,12 +93,23 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Generate Changelog
+        run: |
+          # Get commits since the last tag (or since the beginning)
+          git log --oneline $(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || git rev-list --max-parents=0 HEAD)..HEAD > changelog.txt
+
       - name: Download Artifacts
         uses: actions/download-artifact@v3
 
       - name: Create Release
         uses: softprops/action-gh-release@v1
         with:
+          body_path: changelog.txt
           files: |
             ts3-tui-windows-zip/ts3-tui-windows-x86_64.zip
             ts3-tui-linux-binaries/*