chore: Add cliff to release workflow (#3)

.gitea/workflows/release.yaml

@@ -17,7 +17,8 @@ jobs:
       GITEA_SERVER: ${{ secrets.GITEA_SERVER }}
     steps:
       - uses: actions/checkout@v6
-
+        with:
+          fetch-depth: ''
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           toolchain: nightly
@@ -25,7 +26,16 @@ jobs:
       - name: Build release
         run: |
           cargo build --release
+      - name: Generate a changelog
+        uses: orhun/git-cliff-action@v4
+        id: git-cliff
+        with:
+          config: cliff.toml
+          args: --verbose --unreleased
+        env:
+          OUTPUT: CHANGELOG.md
       - uses: akkuman/gitea-release-action@v1
         with:
           files: |-
             target/release/teachertracker-rs
+          body: ${{ steps.git-cliff.outputs.changelog }}