docs: update docker docs

docker/docker-compose.slim.yml

@@ -1,7 +1,7 @@
 version: "3"
 services:
   rpxy-rp:
-    image: jqtype/rpxy
+    image: jqtype/rpxy:slim # ghcr.io/junkurihara/rust-rpxy:slim also works
     container_name: rpxy
     init: true
     restart: unless-stopped
@@ -9,15 +9,15 @@ services:
       - 127.0.0.1:8080:8080/tcp
       - 127.0.0.1:8443:8443/udp
       - 127.0.0.1:8443:8443/tcp
-    build:
-      context: ../
-      additional_contexts: # Uncomment when you build with musl
-        - messense/rust-musl-cross:amd64-musl=docker-image://messense/rust-musl-cross:x86_64-musl
-        - messense/rust-musl-cross:arm64-musl=docker-image://messense/rust-musl-cross:aarch64-musl
-      dockerfile: ./docker/Dockerfile.slim # based on alpine and build x86_64-unknown-linux-musl
-      platforms: # Choose your platforms
-        - "linux/amd64"
-        # - "linux/arm64"
+    # build: # Uncomment if you build yourself
+    #   context: ../
+    #   additional_contexts:
+    #     - messense/rust-musl-cross:amd64-musl=docker-image://messense/rust-musl-cross:x86_64-musl
+    #     - messense/rust-musl-cross:arm64-musl=docker-image://messense/rust-musl-cross:aarch64-musl
+    #   dockerfile: ./docker/Dockerfile.slim # based on alpine and build x86_64-unknown-linux-musl
+    #   platforms: # Choose your platforms
+    #     - "linux/amd64"
+    #     # - "linux/arm64"
     environment:
       - LOG_LEVEL=debug
       - LOG_TO_FILE=true