ci: run tickgit after merging a PR in the devel branch

The `tickgit.com` webservice seems to not update itself anymore, but
having a list of TODO's is very useful. Use the tickgit project to
gather the TODO's, bit in a GitHub Workflow.

Developers can also run `make containerized-test TARGET=tickgit` to get
the result locally.

Signed-off-by: Niels de Vos <ndevos@ibm.com>

.github/workflows/tickgit.yaml

@@ -0,0 +1,18 @@
+---
+name: List TODO's
+# yamllint disable-line rule:truthy
+on:
+  push:
+    branches:
+      - devel
+
+permissions:
+  contents: read
+
+jobs:
+  tickgit:
+    name: tickgit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: make containerized-test TARGET=tickgit