ci: enable dispatch and add tmate in workflow of cutter (#77)

Author: JonasPammer

.github/workflows/ci.yml

@@ -1,6 +1,7 @@
 name: Test Jinja2
 permissions: read-all
 "on":
+  workflow_dispatch:
   pull_request:
   push:
     branches:
@@ -65,3 +66,8 @@ jobs:
           source project-venv/bin/activate
           tox
         working-directory: ./ansible-role-myrole
+
+      - name: setup tmate session if any previous step failed and if this is a manual run
+        if: ${{ failure() && github.event_name == 'workflow_dispatch' }}
+        uses: mxschmitt/action-tmate@v3
+        timeout-minutes: 30