podcasts: added podgrab as software and to the audio entry

wiki/docker-images/axhilrex_-_podgrab.md

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+# axhilrex - podgrab
+
+This is a docker container for a [Podgrab](../podgrab.md)
+server.
+The official container and documentation was made by
+[axhilrex](https://github.com/akhilrex/podgrab).
+
+## Set-up
+
+Create the file `rebuild.sh`.
+Change the settings according to your needs and run `./rebuild.sh` afterwards.
+
+## Environment-variables
+
+Set the following variables with the -e tag.
+
+| Name       | Usage                         | Default |
+| ---------- | ----------------------------- | ------- |
+| `PASSWORD` | Password for `podgrab` user   |         |
+
+## Volumes
+
+Set the following volumes with the -v tag.
+
+| Outside mount/volume name | Container mount | Description             |
+| ------------------------- | --------------- | ----------------------- |
+| `podgrab_config`          | `/config`       | Configuration files     |
+| `media_podcasts`          | `/assets`       | location for podcasts   |
+
+## Ports
+
+Set the following ports with the -p tag.
+
+| Container Port | Recommended outside port | Protocol | Description |
+| -------------- | ------------------------ | -------- | ----------- |
+| `8080`         | `8080`                   | TCP      | WebUI       |
+
+## rebuild.sh
+
+```sh
+#!/bin/sh
+docker stop podgrab
+docker rm podgrab
+docker pull akhilrex/podgrab
+docker run --name=podgrab \
+  --restart unless-stopped \
+  -p 8000:8080 \
+  -v "media_podcasts:/assets" \
+  -v "podgrab_config:/config" \
+  -d akhilrex/podgrab
+```