add support for service serve to run rclone serve

It is specially desigend to serve a local dir mounted by `rclone mount`. Related environment variables: `RCLONE_SERVE_MODE` `RCLONE_SERVE_ARGS`

Author: wiserain

.github/workflows/buildx.yml

@@ -70,7 +70,6 @@ jobs:
             .
           VER=$(docker run --rm --entrypoint=/usr/bin/rclone ${{ env.IMAGE_NAME }}:testing version | head -n1 | cut -f2 -d'v')
           echo "APP_VER=$VER" >> $GITHUB_ENV
-          echo ::set-output name=github_desc::$(curl -sX GET https://api.github.com/repos/${GITHUB_REPOSITORY} | jq -r .description)
       -
         name: Login to docker.io
         if: env.X_SKIP == 'false'

root/etc/s6-overlay/s6-rc.d/cron/dependencies.d/serve

@@ -0,0 +1,14 @@
+#!/usr/bin/with-contenv bash
+. /usr/local/bin/variables
+
+case "$RCLONE_SERVE_MODE" in
+    dlna|docker|ftp|http|restic|sftp|webdav)
+        ;;
+    *)
+        s6-svc -d . && exit 0
+        ;;
+esac
+
+serve_command="rclone serve $RCLONE_SERVE_MODE ${rclone_mountpoint} ${RCLONE_SERVE_ARGS:---use-mmap --addr=:5678}"
+echo "*** serving => $serve_command"
+exec s6-setuidgid abc $serve_command

root/etc/s6-overlay/s6-rc.d/serve/dependencies.d/mount

@@ -0,0 +1 @@
+longrun