added Dockefile and entrypoint.sh

It uses the latest available version for libtorrent and builds both libtorrent and qBittorrent with Cmake + ninja

The legal notice must be accepted trought an environment variable called LEGAL and passed to docker when the container is run, to set it true one must set "LEGAL=accept"

PR #16828.

dist/docker/Dockerfile

@@ -0,0 +1,37 @@
+
+FROM alpine:latest AS builder
+
+ARG BUILD_TYPE
+ARG RELEASE
+
+RUN if [ $RELEASE = "master" ] ; \
+    then \
+      wget https://github.com/qbittorrent/qBittorrent/archive/refs/heads/master.zip && \
+      unzip master.zip && \
+      cd qBittorrent-master ; \
+    else \
+      wget https://github.com/qbittorrent/qBittorrent/archive/refs/tags/release-${RELEASE}.tar.gz && \
+      tar xf release-${RELEASE}.tar.gz && \
+      cd qBittorrent-release-${RELEASE} ; \
+    fi && \
+    apk add --no-cache qt6-qttools-dev g++ libtorrent-rasterbar-dev cmake boost-dev ninja && \
+    cmake -B build-nox -G "Ninja" -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DGUI=OFF -DQT6=ON -DSTACKTRACE=OFF && \
+    cmake --build build-nox && \
+    cmake --build build-nox --target install/strip
+
+FROM alpine:latest
+
+COPY --from=builder /usr/local/bin/qbittorrent-nox /usr/bin/qbittorrent-nox
+
+COPY entrypoint.sh /entrypoint.sh
+
+RUN chmod +x /entrypoint.sh && \
+    apk add --no-cache qt6-qtbase libtorrent-rasterbar
+
+ENV WEBUI_PORT="8080"
+
+EXPOSE 6881 6881/udp 8080
+
+VOLUME /config /downloads
+
+ENTRYPOINT ["/entrypoint.sh"]

dist/docker/Readme.md

@@ -0,0 +1,67 @@
+# Docker Container Name
+
+This Dockerfile allows you to build a qBittorrent-nox container
+
+## Getting Started
+
+### Prerequisities
+
+
+In order to run this container you'll need docker installed.
+
+* [Windows](https://docs.docker.com/windows/started)
+* [OS X](https://docs.docker.com/mac/started/)
+* [Linux](https://docs.docker.com/linux/started/)
+
+
+## Built
+
+in the docker folder run
+
+```shell
+release="4.2.0" ; sudo docker build --build-arg BUILD_TYPE=Release --build-arg RELEASE=$release -t qbittorrent-nox:$release --rm  .
+```
+
+where:
+
+* the `release` variable is the specific tagged version you want to build
+* the `BUILD_TYPE` argument is the build you want to create `Debug` or `Release`
+* the `RELEASE` argument works as the but is the actual argument given to docker, in the above script is defined by the `release` variable
+
+
+### Usage
+
+#### Container Variables
+
+there is one important variable to run the container:
+
+* the `LEGAL` varible defines if you accept the Legal Notice, put accept as a value only if you understand and accept the Legal Notice
+
+#### Volumes
+
+there are two main locations:
+
+* `downloads` contains the files downloaded by qBittorrent
+* `config` contains qBittorrent configurations
+
+```shell
+docker run give.example.org/of/your/container:v0.2.1 parameters
+```
+
+#### Network
+
+on the port `8080` the webinterface is run
+
+#### RUN
+
+To start the the docker image simply run
+
+```shell
+docker run --env LEGAL=accept -p 8080:8080 -v /your/path/config:/config -v /your/path/download:/downloads --name qBittorrent qbittorrent-nox:4.2.0
+```
+
+to stop the container
+
+```shell
+docker stop qBittorrent
+```

dist/docker/entrypoint.sh

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+#!/bin/sh
+
+if [ ! -f /config/qBittorrent/qBittorrent.conf ]; then
+    mkdir -p /config/qBittorrent/
+    cat << EOF > /config/qBittorrent/qBittorrent.conf
+[BitTorrent]
+Session\DefaultSavePath=/downloads
+Session\TempPath=/downloads/temp
+
+[LegalNotice]
+Accepted=false
+EOF
+fi
+
+if [ "$LEGAL" = "accept" ] ; then
+    sed -i '/^\[LegalNotice\]$/{$!{N;s|\(\[LegalNotice\]\nAccepted=\).*|\1true|}}' /config/qBittorrent/qBittorrent.conf
+else
+    sed -i '/^\[LegalNotice\]$/{$!{N;s|\(\[LegalNotice\]\nAccepted=\).*|\1false|}}' /config/qBittorrent/qBittorrent.conf
+fi
+
+HOME="/config" XDG_CONFIG_HOME="/config" XDG_DATA_HOME="/config" qbittorrent-nox --webui-port=$WEBUI_PORT