Add: Add section about exposing gvmd unix socket to host

src/common/container/workflows.md

@@ -50,3 +50,60 @@ docker-compose -f $DOWNLOAD_DIR/docker-compose.yml -p greenbone-community-editio
 
 Afterwards, you can execute standard bash commands within the running container.
 
+### Expose gvmd Unix Socket for GMP access
+
+To allow using the {term}`GMP` protocol provided by {term}`gvmd` from the docker
+host a [bind mount](https://docs.docker.com/compose/compose-file/compose-file-v3/#volumes)
+must be used for the `/run/gvmd` location. To make the gvmd unix socket
+available, first of all a directory must be created and the permissions need to
+be adjusted.
+
+```sh
+mkdir -p /tmp/gvm/gvmd
+chmod -R 777 /tmp/gvm
+```
+
+Next the docker compose file needs to be changed as follows:
+
+```diff
+  gvmd:
+    image: greenbone/gvmd:stable
+    restart: on-failure
+    volumes:
+       - gvmd_data_vol:/var/lib/gvm
+       - vt_data_vol:/var/lib/openvas
+       - psql_data_vol:/var/lib/postgresql
+-      - gvmd_socket_vol:/run/gvmd
++      - /tmp/gvm/gvmd:/run/gvmd
+       - ospd_openvas_socket_vol:/run/ospd
+       - psql_socket_vol:/var/run/postgresql
+     depends_on:
+      - pg-gvm
+
+...
+
+  gsa:
+    image: greenbone/gsa:stable
+    restart: on-failure
+     ports:
+       - 9392:80
+     volumes:
+-      - gvmd_socket_vol:/run/gvmd
++      - /tmp/gvm/gvmd:/run/gvmd
+     depends_on:
+       - gvmd
+```
+
+After restarting the containers with
+
+```bash
+docker-compose -f $DOWNLOAD_DIR/docker-compose.yml -p greenbone-community-edition up -d
+```
+
+The unix socket should be available at `/tmp/gvm/gvmd/gvmd.sock`. For example
+to use the socket with [gvm-tools](https://github.com/greenbone/gvm-tools) the
+following command can be executed:
+
+```bash
+gvm-cli socket --socketpath /tmp/gvm/gvmd/gvmd.sock --pretty --xml "<get_version/>"
+```