ci: build package before checking version

the version is only available after running poetry build. also remove the current dir from the path, to force the import of the built package

.github/workflows/python-publish.yml

@@ -11,21 +11,22 @@ jobs:
       - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+      - name: Setup Poetry
+        uses: Gr1N/setup-poetry@v9
+      - name: Install deps
+        run: poetry install
       - name: Assert tag version matches __version__ attribute
         run: |
-          pushd aleph_alpha_client
-          python -c "from version import __version__; \
+          python -c "import sys; sys.path.pop(0); \
+            import aleph_alpha_client; \
             git_ref = '${GITHUB_REF#refs/}'; \
             assert git_ref.startswith('tags'), \
               f'{git_ref} is not a version tag'; \
             git_version = '${GITHUB_REF#refs/tags/}'[1:]; \
-            assert __version__ == git_version, \
-              f'versions do not match {__version__} vs. {git_version}. Please update version.py to match the git Release tag.'"
-          popd
-      - name: Setup Poetry
-        uses: Gr1N/setup-poetry@v9
-      - name: Install deps
-        run: poetry install
+            assert aleph_alpha_client.__version__ == git_version, \
+              f'versions do not match {aleph_alpha_client.__version__} vs. {git_version}. Please update version.py to match the git Release tag.'"
       - name: Build
         run: poetry build
       - name: Publish