Support multiple platforms.

Dockerfile

@@ -18,6 +18,8 @@ FROM ${ARCH}ossrs/srs:tools AS tools
 # See https://hub.docker.com/r/jrei/systemd-ubuntu/tags
 FROM ${ARCH}jrei/systemd-ubuntu:focal AS dist
 
+ARG TARGETARCH
+
 # Copy nodejs for ui build.
 COPY --from=node /usr/local/bin /usr/local/bin
 COPY --from=node /usr/local/lib /usr/local/lib
@@ -64,5 +66,13 @@ RUN cd /tmp && \
     echo "Remove the BT plugin webssh, a SSH tool." && \
     if [[ -f /www/server/panel/plugin/webssh/install.sh ]]; then bash /www/server/panel/plugin/webssh/install.sh uninstall; fi && \
     echo "Install NGINX for BT." && \
-    curl -sSL https://download.bt.cn/install/4/lib.sh |bash -s -- && \
-    curl -sSL https://download.bt.cn/install/4/nginx.sh |bash -s -- install 1.22
+    curl -sSL https://download.bt.cn/install/4/lib.sh |bash -s --
+
+# Note: We install nginx 1.22 by default, like:
+#       http://localhost:7800/plugin?action=install_plugin
+#       sName=nginx&version=1.22&min_version=1&type=1
+RUN if [[ $TARGETARCH != 'arm64' ]]; then \
+      cd /tmp && \
+      echo "Install NGINX for aaPanel." && \
+      curl -sSL https://node.aapanel.com/install/4/nginx.sh |bash -s -- install 1.22; \
+    fi