fix action path

.gitea/actions/poetrybuild/action.yaml

@@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: 2023 DB Systel GmbH
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: "Reusable Poetry build workflow"
+inputs:
+  python:
+    default: "3.9"
+    description: "Value for 'python-version'"
+    required: false
+    type: string
+runs:
+  using: "composite"
+  steps:
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ inputs.python }}
+    - name: Install dependencies
+      run: |
+        pip install poetry
+        poetry install --no-interaction
+      shell: bash