Update Dockerfile to support multiple architectures

Author: Anga205

Dockerfile

@@ -10,10 +10,14 @@ RUN apt-get update \
     && apt-get install -y --no-install-recommends ca-certificates curl tar \
     && rm -rf /var/lib/apt/lists/*
 
-RUN curl -fsSL "https://go.dev/dl/go${GO_VERSION}.linux-amd64.tar.gz" -o /tmp/go.tgz \
-    && rm -rf /usr/local/go \
-    && tar -C /usr/local -xzf /tmp/go.tgz \
-    && rm -f /tmp/go.tgz
+RUN ARCH=$(dpkg --print-architecture) && \
+    if [ "$ARCH" = "amd64" ]; then GOARCH=amd64; \
+    elif [ "$ARCH" = "arm64" ]; then GOARCH=arm64; \
+    else echo "Unsupported arch: $ARCH" && exit 1; fi && \
+    curl -fsSL "https://go.dev/dl/go${GO_VERSION}.linux-${GOARCH}.tar.gz" -o /tmp/go.tgz && \
+    rm -rf /usr/local/go && \
+    tar -C /usr/local -xzf /tmp/go.tgz && \
+    rm -f /tmp/go.tgz
 
 ENV PATH="/usr/local/go/bin:${PATH}"
 WORKDIR /src