refactor: update release notes handling in build workflow

.gitea/workflows/build.yaml

@@ -48,12 +48,13 @@ jobs:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         branch: ${{ github.ref }}
     
-    - name: Add release notes to environment
-      id: add_release_notes
+    - name: Create release notes
       run: |
-        echo "RELEASE_NOTES<<EOF" >> $GITHUB_ENV
-        echo "${{ github.event.inputs.release_notes }}" >> $GITHUB_ENV
-        echo "EOF" >> $GITHUB_ENV  
+        mkdir release_notes
+        echo -e "${{ inputs.release_notes }}" >> release_notes/release_notes.md
+        echo "Release notes:"
+        cat release_notes/release_notes.md
+        echo ""
     - name: Build package
       run: uv build
     - name: Publish package
@@ -69,7 +70,7 @@ jobs:
       with:
         tag_name: ${{ env.VERSION }}
         release_name: Release ${{ env.VERSION }}
-        body: ${{ inputs.release_notes }}
+        body_path: release_notes/release_notes.md
         draft: false
         prerelease: false
         make_latest: true