Fix Docker image not supporting the arm64 platform (#125)

Author: mrproliu

CHANGES.md

@@ -16,6 +16,7 @@ Release Notes.
 * Add `Tracing APIs` document into `Manual APIs`.
 
 #### Bug Fixes
+* Fix Docker image not supporting the `arm64` platform.
 
 #### Issues and PR
 - All issues are [here](https://github.com/apache/skywalking/milestone/189?closed=1)

Dockerfile

@@ -22,9 +22,12 @@ ARG BASE_BUILDER_IMAGE='golang:1.18'
 FROM ${BASE_BUILDER_IMAGE} as builder
 # Go Agent Version
 ARG VERSION
+# Current ARCH
+ARG TARGETARCH
+
 WORKDIR /skywalking-go
 COPY . .
-RUN VERSION=$VERSION make -C tools/go-agent linux
+RUN VERSION=$VERSION ARCH=$TARGETARCH make -C tools/go-agent linux
 
 FROM ${BASE_GO_IMAGE}