Rework Docker image (#5087)

* fix #5086

* fixes #5082

- run tendermint init on runtime (if necessary)

* Address some feedback:

 - restrict the entrypoint to only run `tendermint`
 - script into /usr/local/bin

* make it also possible to run ``ith unmodified config again via:

`docker run -v $HOME/.tendermint:/tendermint tendermint/tendermint init

* Update DOCKER/docker-entrypoint.sh

Co-authored-by: Greg Szabo <16846635+greg-szabo@users.noreply.github.com>

Co-authored-by: Greg Szabo <16846635+greg-szabo@users.noreply.github.com>

DOCKER/Dockerfile

@@ -27,28 +27,21 @@ WORKDIR $TMHOME
 # p2p, rpc and prometheus port
 EXPOSE 26656 26657 26660
 
-ENTRYPOINT ["/usr/bin/tendermint"]
-CMD ["node"]
 STOPSIGNAL SIGTERM
 
 ARG BINARY=tendermint
 COPY $BINARY /usr/bin/tendermint
 
-# Create default configuration for docker run.
-RUN /usr/bin/tendermint init && \
-    sed -i \
-      -e 's/^proxy_app\s*=.*/proxy_app = "kvstore"/' \
-      -e 's/^moniker\s*=.*/moniker = "dockernode"/' \
-      -e 's/^addr_book_strict\s*=.*/addr_book_strict = false/' \
-      -e 's/^timeout_commit\s*=.*/timeout_commit = "500ms"/' \
-      -e 's/^index_all_tags\s*=.*/index_all_tags = true/' \
-      -e 's,^laddr = "tcp://127.0.0.1:26657",laddr = "tcp://0.0.0.0:26657",' \
-      -e 's/^prometheus\s*=.*/prometheus = true/' \
-      $TMHOME/config/config.toml && \
-    sed -i \
-      -e 's/^\s*"chain_id":.*/  "chain_id": "dockerchain",/' \
-      $TMHOME/config/genesis.json
+# You can overwrite these before the first run to influence
+# config.json and genesis.json. Additionally, you can override
+# CMD to add parameters to `tendermint node`.
+ENV PROXY_APP=kvstore MONIKER=dockernode CHAIN_ID=dockerchain
+
+COPY ./docker-entrypoint.sh /usr/local/bin/
+
+ENTRYPOINT ["docker-entrypoint.sh"]
+CMD ["node"]
 
 # Expose the data directory as a volume since there's mutable state in there
-VOLUME [ $TMHOME ]
+VOLUME [ "$TMHOME" ]