update legacy Dockerfile to use knesset-data-python from git master

Dockerfile

@@ -10,8 +10,10 @@ FROM ghcr.io/hasadna/knesset-data-pipelines/knesset-data-pipelines:8028b98004108
 #COPY Pipfile.lock /pipelines/
 #RUN pipenv install --system --deploy --ignore-pipfile
 #RUN python3 -m pip install jupyterlab
-RUN pip uninstall -y knesset-data &&\
-    pip install -e 'git+https://github.com/hasadna/knesset-data-python.git@3e3141ff76eabf20a72d16fc098544759f5952a8#egg=knesset-data'
+RUN KNESSET_DATA_COMMIT=3e3141ff76eabf20a72d16fc098544759f5952a8 &&\
+    pip uninstall -y knesset-data &&\
+    pip install -e "git+https://github.com/hasadna/knesset-data-python.git@${KNESSET_DATA_COMMIT}#egg=knesset-data" &&\
+    echo "__version__ = '${KNESSET_DATA_COMMIT}'" >> /pipelines/src/knesset-data/knesset_data/__init__.py
 COPY datapackage_pipelines_knesset /pipelines/datapackage_pipelines_knesset
 COPY setup.py /pipelines/
 RUN pip install -e .