transmission:transmission-web-control initial release

This mod provides a web UI called Transmission Web Control for transmission.
It was once removed when transmission was upgraded to v4.0.

Dockerfile

@@ -1,8 +1,32 @@
 # syntax=docker/dockerfile:1
 
-FROM scratch
+FROM ghcr.io/linuxserver/baseimage-alpine:3.17 as buildstage
 
-LABEL maintainer="username"
+ARG MOD_VERSION
+
+RUN \
+  echo "**** grab transmission-web-control ****" && \
+  mkdir -p /root-layer/themes && \
+  if [ -z ${MOD_VERSION} ]; then \
+    MOD_VERSION=$(curl -s "https://api.github.com/repos/ronggang/transmission-web-control/releases/latest" \
+    | jq -rc ".tag_name"); \
+  fi && \
+  curl -o \
+    /tmp/transmission-web-control.tar.gz -L \
+    "https://github.com/ronggang/transmission-web-control/archive/refs/tags/${MOD_VERSION}.tar.gz" && \
+  mkdir -p /root-layer/themes/transmission-web-control && \
+  tar xzf \
+    /tmp/transmission-web-control.tar.gz -C \
+    /root-layer/themes/transmission-web-control \
+    $(tar tf /tmp/transmission-web-control.tar.gz | grep -E "^[^/]+/src") --strip-components=2
 
 # copy local files
-COPY root/ /
+COPY root/ /root-layer/
+
+# ## Single layer deployed image ##
+FROM scratch
+
+LABEL maintainer="FujiZ"
+
+# # Add files from buildstage
+COPY --from=buildstage /root-layer/ /