feat: ssh tunnel (#292)

* Added ccp module for a ssh tunnel

Usage details under https://github.com/samply/ssh-tunnel

* chore: update ssh-tunnel image to harbor

* feat: ssh tunnel support diffrent port

* chore: fix indentation

* chore: move to top level modules

* docs: add ssh-tunnel docs

---------

Co-authored-by: Tobias Kussel <tobias.kussel@dkfz-heidelberg.de>

modules/ssh-tunnel-compose.yml

@@ -0,0 +1,17 @@
+version: "3.7"
+
+services:
+  ssh-tunnel:
+    image: docker.verbis.dkfz.de/cache/samply/ssh-tunnel
+    container_name: bridgehead-ccp-ssh-tunnel
+    environment:
+      SSH_TUNNEL_USERNAME: "${SSH_TUNNEL_USERNAME}"
+      SSH_TUNNEL_HOST: "${SSH_TUNNEL_HOST}"
+      SSH_TUNNEL_PORT: "${SSH_TUNNEL_PORT:-22}"
+    volumes:
+      - "/etc/bridgehead/ssh-tunnel.conf:/ssh-tunnel.conf:ro"
+    secrets:
+      - privkey
+secrets:
+  privkey:
+    file: /etc/bridgehead/pki/ssh-tunnel.priv.pem