CI: install task

Author: LostInDarkMath

.github/workflows/main.yml

@@ -18,6 +18,10 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
         check-latest: true
+    - name: Set up task
+      run: |
+        curl -1sLf 'https://dl.cloudsmith.io/public/task/task/setup.deb.sh' | sudo -E bash
+        apt install task
     - name: Install dependencies
       run: |
         task dependencies