chore: minor Dockerfile style changes (#202)

Author: michael1011

Dockerfile

@@ -1,8 +1,8 @@
 ARG GO_VERSION
 ARG GDK_VERSION
 
-FROM golang:$GO_VERSION-alpine as go
-FROM boltz/gdk-ubuntu:$GDK_VERSION as builder
+FROM golang:$GO_VERSION-alpine AS go
+FROM boltz/gdk-ubuntu:$GDK_VERSION AS builder
 
 COPY --from=go /usr/local/go /usr/local/go
 ENV PATH="/usr/local/go/bin:$PATH"
@@ -21,7 +21,7 @@ COPY --from=builder /boltz-client/boltzd /
 COPY --from=builder /boltz-client/boltzcli /
 
 # Start a new, final image.
-FROM ubuntu:jammy as final
+FROM ubuntu:jammy AS final
 
 RUN apt update && apt install ca-certificates -y && rm -rf /var/lib/apt/lists/*
 

compat.Dockerfile

@@ -1,14 +1,14 @@
-FROM golang:1.20.2 as old-builder
+FROM golang:1.20.2 AS old-builder
 
-# Shallow clone project.
+# Shallow clone project
 RUN git clone --depth=1 --branch v1.2.7 https://github.com/BoltzExchange/boltz-lnd /go/src/github.com/BoltzExchange/boltz-lnd
 
-# Build the binaries.
+# Build the binaries
 RUN cd /go/src/github.com/BoltzExchange/boltz-lnd \
     && go mod vendor \
     && make build
 
-FROM boltz/boltz-client:latest as final
+FROM boltz/boltz-client:latest AS final
 
 VOLUME /root/.boltz
 

gdk.Dockerfile

@@ -1,10 +1,11 @@
 ARG GDK_VERSION
-FROM michael1011/gdk-ubuntu-builder:$GDK_VERSION as builder
+FROM michael1011/gdk-ubuntu-builder:$GDK_VERSION AS builder
 
 ARG GDK_VERSION
 ARG GDK_ARGS
 
 RUN git clone https://github.com/Blockstream/gdk --depth 1 --branch release_$GDK_VERSION
-RUN export PATH="/root/.cargo/bin:$PATH" && cd gdk && ./tools/build.sh --gcc --buildtype release --no-deps-rebuild --external-deps-dir /prebuild/gcc $GDK_ARGS
+RUN export PATH="/root/.cargo/bin:$PATH" && cd gdk && \
+    ./tools/build.sh --gcc --buildtype release --no-deps-rebuild --external-deps-dir /prebuild/gcc $GDK_ARGS
 
 ENTRYPOINT []