fix: executable privilege (#589)

Fixing `/usr/bin/clash` not having executable permissions in the image

.github/Dockerfile

@@ -3,7 +3,7 @@ FROM alpine:latest
 ARG TARGETARCH
 COPY ./clash-rs/clash-${TARGETARCH} /usr/bin/clash
 # The yq library installed here is used to rewrite the config.yaml configuration file for clash, merge it, and other related operations.
-RUN apk update && apk add --no-cache -f yq && mkdir -p /root/.config/clash/
+RUN apk update && apk add --no-cache -f yq && mkdir -p /root/.config/clash/ && chmod +x /usr/bin/clash
 WORKDIR /root
 ENTRYPOINT [ "/usr/bin/clash" ]
 CMD [ "-d", "/root/.config/clash/" ]