fix(docker): remove duplicate rm, fix sha256 verification, cleanup temp files

Co-authored-by: ss-o <59910950+ss-o@users.noreply.github.com>
Agent-Logs-Url: https://github.com/z-shell/zd/sessions/52852c1d-a94c-4473-8417-a726a56420b5

Author: Copilot

docker/Dockerfile

@@ -42,18 +42,18 @@ RUN set -ex && apk --no-cache add \
 RUN set -ex \
   && ARCH="$(uname -m)" \
   && case "$ARCH" in \
-       x86_64)       GOARCH="amd64" ;; \
-       aarch64)      GOARCH="arm64" ;; \
+       x86_64)        GOARCH="amd64" ;; \
+       aarch64)       GOARCH="arm64" ;; \
        armv6l|armv7l) GOARCH="armv6l" ;; \
-       *)       echo "Unsupported arch: $ARCH" && exit 1 ;; \
+       *)             echo "Unsupported arch: $ARCH" && exit 1 ;; \
      esac \
-  && rm -rf /usr/local/go \
   && GO_TARBALL="go${GO_VERSION}.linux-${GOARCH}.tar.gz" \
   && rm -rf /usr/local/go \
   && curl -fsSL "https://go.dev/dl/${GO_TARBALL}" -o "/tmp/${GO_TARBALL}" \
   && curl -fsSL "https://go.dev/dl/${GO_TARBALL}.sha256" -o "/tmp/${GO_TARBALL}.sha256" \
-  && sha256sum -c "/tmp/${GO_TARBALL}.sha256" \
+  && echo "$(cat "/tmp/${GO_TARBALL}.sha256")  /tmp/${GO_TARBALL}" | sha256sum -c - \
   && tar -C /usr/local -xzf "/tmp/${GO_TARBALL}" \
+  && rm -f "/tmp/${GO_TARBALL}" "/tmp/${GO_TARBALL}.sha256" \
   && go version
 
 WORKDIR $DIR