introduce docker image updater

.github/workflows/Dockerfile

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+FROM alpine:latest AS builder
+
+ARG TARGETPLATFORM
+
+COPY . /tmp/artifacts
+RUN mkdir -p /tmp/output; \
+    cd /tmp/artifacts; \
+    ARTIFACT_ARCH=""; \
+    if [ "$TARGETPLATFORM" = "linux/amd64" ]; then \
+        ARTIFACT_ARCH="x86_64"; \
+    elif [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
+        ARTIFACT_ARCH="aarch64"; \
+    else \
+        echo "Unsupported architecture: $TARGETARCH"; \
+        exit 1; \
+    fi; \
+    cp /tmp/artifacts/easytier-linux-${ARTIFACT_ARCH}/* /tmp/output;
+
+FROM alpine:latest
+
+WORKDIR /app
+COPY --from=builder --chmod=755 /tmp/output/* /usr/local/bin
+
+# tcp
+EXPOSE 11010/tcp
+# udp
+EXPOSE 11010/udp
+# wg
+EXPOSE 11011/udp
+# ws
+EXPOSE 11011/tcp
+# wss
+EXPOSE 11012/tcp
+
+ENTRYPOINT ["easytier-core"]