Update ci.yml to perform a multi-variant build

Dockerfile.slim

@@ -0,0 +1,40 @@
+FROM python:3-slim
+
+ENV DRYRUN 'True'
+ENV DEBUG 'True'
+ENV DEBUG_LEVEL 'INFO'
+ENV SLEEP_DURATION '3600'
+ENV LOGFILE 'log.log'
+
+ENV USER_MAPPING ''
+ENV LIBRARY_MAPPING ''
+
+ENV PLEX_BASEURL ''
+ENV PLEX_TOKEN ''
+ENV PLEX_USERNAME ''
+ENV PLEX_PASSWORD ''
+ENV PLEX_SERVERNAME ''
+
+ENV JELLYFIN_BASEURL ''
+ENV JELLYFIN_TOKEN ''
+
+ENV SYNC_FROM_PLEX_TO_JELLYFIN 'True'
+ENV SYNC_FROM_JELLYFIN_TO_PLEX 'True'
+ENV SYNC_FROM_PLEX_TO_PLEX 'True'
+ENV SYNC_FROM_JELLYFIN_TO_JELLYFIN 'True'
+
+ENV BLACKLIST_LIBRARY ''
+ENV WHITELIST_LIBRARY ''
+ENV BLACKLIST_LIBRARY_TYPE  '' 
+ENV WHITELIST_LIBRARY_TYPE  ''
+ENV BLACKLIST_USERS  ''
+ENV WHITELIST_USERS  ''
+
+WORKDIR /app
+
+COPY ./requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["python", "-u", "main.py"]