serve/docker: allow to customize proxy settings of docker plugin

cmd/serve/docker/contrib/plugin/Dockerfile

@@ -26,6 +26,10 @@ ENV RCLONE_CACHE_DIR=/data/cache
 ENV RCLONE_BASE_DIR=/mnt
 ENV RCLONE_VERBOSE=0
 
+ENV HTTP_PROXY=
+ENV HTTPS_PROXY=
+ENV NO_PROXY=
+
 WORKDIR /data
 ENTRYPOINT ["/usr/local/bin/rclone"]
 CMD ["serve", "docker"]

cmd/serve/docker/contrib/plugin/config.json

@@ -42,6 +42,21 @@
         {
             "name": "RCLONE_BASE_DIR",
             "value": "/mnt"
+        },
+        {
+            "name": "HTTP_PROXY",
+            "value": "",
+            "settable": ["value"]
+        },
+        {
+            "name": "HTTPS_PROXY",
+            "value": "",
+            "settable": ["value"]
+        },
+        {
+            "name": "NO_PROXY",
+            "value": "",
+            "settable": ["value"]
         }
     ],
     "mounts": [