add CI tests and publishing workflows

.gitea/actions/poetrybuild/action.yaml

@@ -0,0 +1,13 @@
+# SPDX-FileCopyrightText: 2023 DB Systel GmbH
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: "Reusable Poetry build workflow"
+runs:
+  using: "composite"
+  steps:
+    - name: Install dependencies
+      run: |
+        pip install poetry
+        poetry install --no-interaction
+      shell: bash