chore(lint): some lint suggestions for Dockerfile

Note that this file is used from the root of the project via `make
localnet-build`, which is why the paths work.

networks/local/exocore/Dockerfile

@@ -1,5 +1,5 @@
-FROM golang:1.21-alpine AS build
-RUN apk add build-base linux-headers git
+FROM golang:1.21.0-alpine3.18 AS build
+RUN apk add --no-cache build-base=0.5-r3 linux-headers=6.3-r0 git=2.40.1-r0
 # Set working directory for the build
 WORKDIR /go/work
 # Add source files
@@ -9,16 +9,17 @@ COPY . ./
 RUN LEDGER_ENABLED=false make build
 
 #####################################
-FROM alpine AS run
-RUN apk add bash curl jq
+FROM alpine:3.18 AS run
+RUN apk add --no-cache bash=5.2.15-r5 curl=8.5.0-r0 jq=1.6-r4
 EXPOSE 26656 26657 1317 9090 8545 8546
 # TODO: exocore testnet chainid is still under consideration and need to be finalized later
-CMD ["start", "--log_format", "plain","--chain-id","exocoretestnet_233-1", "--metrics", "--json-rpc.api", "eth,txpool,personal,net,debug,web3", "--api.enable", "--json-rpc.enable", "true"]
+CMD ["start", "--log_format", "plain", "--chain-id", "exocoretestnet_233-1", "--metrics", "--json-rpc.api", "eth,txpool,personal,net,debug,web3", "--api.enable", "--json-rpc.enable", "true", "--minimum-gas-prices", "0.0001aexocore"]
+# by default, a SIGKILL is sent after 10 seconds. We need to override this to allow graceful shutdown.
 STOPSIGNAL SIGTERM
 VOLUME /exocore
 WORKDIR /exocore
 
-COPY networks/local/exocore/wrapper.sh /usr/bin/wrapper.sh
+COPY ./networks/local/exocore/wrapper.sh /usr/bin/wrapper.sh
 COPY --from=build /go/work/build/exocored /exocore
 
 ENTRYPOINT ["/usr/bin/wrapper.sh"]