Added comments into dockerfile

Dockerfile

@@ -1,29 +1,28 @@
 # syntax=docker/dockerfile:1.4
-
 FROM rust:alpine3.19 as build-environment
 
 ARG TARGETARCH
 WORKDIR /opt
 
 RUN apk add lld build-base linux-headers pkgconf openssl-dev
-# RUN apk add clang lld curl build-base linux-headers git pkgconf openssl-dev \
-#     && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > rustup.sh \
-#     && chmod +x ./rustup.sh \
-#     && ./rustup.sh -y
 
 RUN echo "export RUSTFLAGS='-Ctarget-feature=-crt-static'" >> $HOME/.profile
+# Mac M1 workaround
 RUN [[ "$TARGETARCH" = "arm64" ]] && echo "export CFLAGS=-mno-outline-atomics" >> $HOME/.profile || true
 
 WORKDIR /opt/challenger
 COPY . .
 
-RUN --mount=type=cache,target=/root/.cargo/registry --mount=type=cache,target=/root/.cargo/git --mount=type=cache,target=/opt/challenger/target \
+RUN --mount=type=cache,target=/root/.cargo/registry \
+    --mount=type=cache,target=/root/.cargo/git \
+    --mount=type=cache,target=/opt/challenger/target \
     source $HOME/.profile \
     && cargo build --release \
     && mkdir out \
     && mv target/release/challenger out/challenger \
     && strip out/challenger;
 
+# Runner image
 FROM alpine:3.19 as challenger-client
 
 RUN apk add --no-cache linux-headers gcompat libgcc