chore: fix docker build warnings

Dockerfile-localnet

@@ -1,7 +1,8 @@
-# syntax=ghcr.io/zeta-chain/docker-dockerfile:1.7-labs
+# syntax=ghcr.io/zeta-chain/docker-dockerfile:1.9-labs
+# check=error=true
 FROM ghcr.io/zeta-chain/golang:1.22.5-bookworm AS base-build
 
-ENV GOPATH /go
+ENV GOPATH=/go
 ENV GOOS=linux
 ENV CGO_ENABLED=1
 ENV GOCACHE=/root/.cache/go-build
@@ -41,7 +42,7 @@ RUN mkdir -p /root/.zetacored/cosmovisor/genesis/bin && \
     ln -s /usr/local/bin/zetaclientd /root/.zetaclientd/upgrades/genesis/zetacored && \
     ln -s /root/.zetaclientd/upgrades/genesis /root/.zetaclientd/upgrades/current
 
-ENV PATH /root/.zetacored/cosmovisor/current/bin/:/root/.zetaclientd/upgrades/current/:${PATH}
+ENV PATH=/root/.zetacored/cosmovisor/current/bin/:/root/.zetaclientd/upgrades/current/:${PATH}
 
 COPY contrib/localnet/scripts /root
 COPY contrib/localnet/ssh_config /etc/ssh/ssh_config.d/localnet.conf
@@ -62,7 +63,7 @@ COPY --from=latest-build /go/bin/zetacored /go/bin/zetaclientd /go/bin/zetaclien
 
 # Optional old version build (from source). This old build is used as the genesis version in the upgrade tests. 
 # Use --target latest-runtime to skip.
-FROM base-build as old-build-source
+FROM base-build AS old-build-source
 
 ARG OLD_VERSION
 RUN git clone https://github.com/zeta-chain/node.git

contrib/localnet/orchestrator/Dockerfile.fastbuild

@@ -1,6 +1,8 @@
-FROM zetanode:latest as zeta
-FROM ghcr.io/zeta-chain/ethereum-client-go:v1.10.26 as geth
-FROM ghcr.io/zeta-chain/golang:1.22.5-bookworm as orchestrator
+# syntax=ghcr.io/zeta-chain/docker-dockerfile:1.9-labs
+# check=error=true
+FROM zetanode:latest AS zeta
+FROM ghcr.io/zeta-chain/ethereum-client-go:v1.10.26 AS geth
+FROM ghcr.io/zeta-chain/golang:1.22.5-bookworm AS orchestrator
 
 RUN apt update && \
     apt install -yq jq yq curl tmux python3 openssh-server iputils-ping iproute2 && \