feat(docker-documentation): add docker deploy docs

docs/docker/setup.md

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+# Docker Setup
+
+You can find the offical Docker Version of LinkStack [here](https://github.com/linkstackorg/linkstack-docker).
+
+The docker version of LinkStack retains all the features and customization options of the [original version](https://github.com/JulianPrieber/littlelink-custom).
+
+This docker is based on [Alpine Linux](https://www.alpinelinux.org/), a Linux distribution designed to be small, simple and secure. The web server is running [Apache2](https://www.apache.org/), a free and open-source cross-platform web server software. The docker comes with [PHP 8.0](https://www.php.net/releases/8.0/en.php) for high compatibility and performance.
+
+## Deployment
+The Docker Image exposes HTTP on port 80 and HTTPS on Port 443. You can modify your deployment via the following optional environment variables
+
+|Variable|Function|default Value|
+|---|---|---|
+|SERVER_ADMIN|The admin's email address|you@example.com|
+|HTTP_SERVER_NAME|the http [server name](https://httpd.apache.org/docs/2.4/fr/mod/core.html#servername) of apache2|localhost|
+|HTTPS_SERVER_NAME|the https [server name](https://httpd.apache.org/docs/2.4/fr/mod/core.html#servername) of apache2|localhost|
+|LOG_LEVEL|The [log level](https://httpd.apache.org/docs/2.4/fr/mod/core.html#loglevel) of apache2|info|
+|TZ|The [timezone](https://www.php.net/manual/timezones.php)|UTC|
+|PHP_MEMORY_LIMIT|The php [memory-limit](https://www.php.net/manual/ini.core.php#ini.memory-limit)|256M|
+|UPLOAD_MAX_FILESIZE| The [upload-max-filesize](https://www.php.net/manual/en/ini.core.php#ini.upload-max-filesize) of PHP|8M|
+
+### Supported Architectures
+- linux/amd64
+- linux/arm/v6
+- linux/arm/v7
+- linux/arm64
+
+### Docker Run Deployment
+
+```shell
+docker volume create linkstack
+
+docker run --detach \
+    --name linkstack \
+    --publish 80:80 \
+    --publish 443:443 \
+    --restart unless-stopped \
+    --mount source=linkstack,target=/htdocs \
+    linkstackorg/linkstack
+```
+
+customized:
+
+```shell
+docker run --detach \
+    --name linkstack \
+    --hostname linkstack \
+    --env HTTP_SERVER_NAME="www.example.xyz" \
+    --env HTTPS_SERVER_NAME="www.example.xyz" \
+    --env SERVER_ADMIN="admin@example.xyz" \
+    --env TZ="Europe/Berlin" \
+    --env PHP_MEMORY_LIMIT="512M" \
+    --env UPLOAD_MAX_FILESIZE="8M" \
+    --publish 80:80 \
+    --publish 443:443 \
+    --restart unless-stopped \
+    --mount source=linkstack,target=/htdocs \
+    linkstackorg/linkstack
+```
+
+### Docker Compose Stack
+
+```yaml
+version: '3'
+services:
+  linkstack:
+    image: linkstackorg/linkstack:latest
+    environment:
+      - TZ=Europe/Berlin
+      - SERVER_ADMIN=admin@example.xyz
+      - HTTP_SERVER_NAME=www.example.xyz
+      - HTTPS_SERVER_NAME=www.example.xyz 
+      - LOG_LEVEL=info
+      - PHP_MEMORY_LIMIT=512M
+      - UPLOAD_MAX_FILESIZE=16M
+    volumes:
+      - linkstack:/htdocs
+    restart: unless-stopped
+volumes:
+  linkstack:
+```
+
+## Docker Bind Mounts
+It's also possible to run the image with [Docker Bind Mounts](https://docs.docker.com/storage/bind-mounts/) instead of [Docker Volumes](https://docs.docker.com/storage/volumes/). But you have to download the [latest release of linkstack](https://github.com/linkstackorg/linkstack/releases/latest/download/linkstack.zip) by yourself and place it in the mounted directory if you do that. Be sure to give the files the owner and group `apache` with the uid 100 and gid 101.