linux: add CTF for the students who already know linux

Use docker compose to reference image to facilitate updates in the future with renovate. The image was build locally for now. Use a profile that the container does not start with docker compose up -d. Repo: https://github.com/BacLuc/learn-linux-by-ctf If it proves useful, we can improve that.
scs · Mar 25, 2024 · a55c567 · a55c567
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diff --git a/topics/linux/code/docker-compose.yml b/topics/linux/code/docker-compose.yml
@@ -6,3 +6,7 @@ services:
       - ./hello_world_service:/hello_world_service/hello_world_service
       - ./solution:/hello_world_service/solution
     privileged: true
+  learn-linux-by-ctf:
+    image: ghcr.io/bacluc/learn-linux-by-ctf:2024-03
+    profiles:
+      - learn-linux-by-ctf
diff --git a/topics/linux/linux_exercise.md b/topics/linux/linux_exercise.md
@@ -148,3 +148,18 @@ Startet der Service auch neu?
 \lstinputlisting{code/solution/update-hello-world-service.sh}
 
 <#endif>
+
+### Learn Linux by Capture the Flag (CTF)
+
+Für die schnellen sind zusätzliche Übungen mit einem Capture the Flag vorbereitet.
+Starte das CTF mit:
+
+```shell
+cd topics/linux/code
+docker compose run learn-linux-by-ctf
+```
+
+Taken from:
+
+- [guye1296/learn-linux-by-ctf](https://github.com/guye1296/learn-linux-by-ctf), Lizenz: [GPL-3.0](https://github.com/guye1296/learn-linux-by-ctf#GPL-3.0-1-ov-file)
+- [fluxkompensat0r/learn-linux-by-ctf](https://github.com/fluxkompensat0r/learn-linux-by-ctf), Lizenz: [GPL-3.0](https://github.com/fluxkompensat0r/learn-linux-by-ctf#GPL-3.0-1-ov-file)