fix: Add multiple labels in backend, import and export (#101)

- Add multiple labels (to support branch and taxonomy labelling) in parser
- Add multiple labels in unparser and tests
- Changed API endpoints accordingly to support different branches and taxonomies
- Wrapped entries.py in a class for easier use
- Added import functionality
- Added export functionality

fixes: 
- #69 
relates to:
- #71 
- #83

.env

@@ -1,6 +1,9 @@
 # use windows path separator for compat
 COMPOSE_PATH_SEPARATOR=;
 COMPOSE_FILE=docker-compose.yml;docker/dev.yml
+
+DOCKER_TAG=dev
+
 # domain name
 TAXONOMY_EDITOR_DOMAIN=taxonomy.localhost
 # exposition

backend/Dockerfile

@@ -14,12 +14,17 @@ RUN groupadd -g $USER_GID off && \
     mkdir -p /home/off && \ 
     chown off:off -R /code /home/off
 
-COPY ./requirements.txt /code/requirements.txt
+COPY backend/requirements.txt /code/requirements.txt
+COPY backend/editor /code/editor
+COPY parser  /parser
+
 RUN pip3 install --no-cache-dir --upgrade -r /code/requirements.txt
+# this is purely cosmetic
+RUN     ln -s /parser/openfoodfacts_taxonomy_parser /code/openfoodfacts_taxonomy_parser
 RUN --mount=type=cache,id=pip-cache,target=/root/.cache/pip \
     pip3 install --upgrade -r /code/requirements.txt
 
 USER off:off
-COPY --chown=off:off ./editor /code/editor
+COPY --chown=off:off ./backend/editor /code/editor
 
-CMD ["uvicorn", "editor.api:app", "--host", "0.0.0.0", "--port", "80"]
+CMD ["uvicorn", "editor.api:app", "--host", "0.0.0.0", "--port", "80"]