add sentinel + correction ninegate/nineskeletor + add nine pull

misc/images/sentinel/containers/Dockerfile

@@ -0,0 +1,19 @@
+FROM redis:6-alpine
+ 
+ENV SENTINEL_QUORUM 2
+ENV SENTINEL_DOWN_AFTER 1000
+ENV SENTINEL_FAILOVER 1000
+ 
+RUN mkdir -p /redis
+ 
+WORKDIR /redis
+ 
+COPY sentinel.conf .
+COPY sentinel-entrypoint.sh /usr/local/bin/
+ 
+RUN chown redis:redis /redis/* && \
+    chmod +x /usr/local/bin/sentinel-entrypoint.sh
+ 
+EXPOSE 26379
+ 
+ENTRYPOINT ["sentinel-entrypoint.sh"]