Update Dockerfile

Dockerfile

@@ -14,7 +14,4 @@ ENV CALENDAR_NAME $CALENDAR_NAME
 ENV USERNAME $USERNAME
 ENV PASSWORD $PASSWORD
 ENV RA_API $RA_API
-ENV RA_USER $RA_USER
-
-ENTRYPOINT ["sh", "-c"]
-CMD python3 ./app.py "$CALDAV_URL" "$CALENDAR_NAME" "$USERNAME" "$PASSWORD" "$RA_API" "$RA_USER"
+ENV RA_USER $RA_USER