feat(dev): add socat

Required for piping serial over IP.

PR: zmkfirmware/zmk-docker#55

.github/workflows/containers.yml

@@ -404,6 +404,8 @@ jobs:
         run: ssh -V
       - name: Test gdb
         run: gdb --version
+      - name: Test socat
+        run: socat -V
       - name: Stop container
         shell: bash
         run: docker stop candidate

Dockerfile

@@ -64,6 +64,7 @@ RUN \
   python3-setuptools \
   python3-tk \
   python3-wheel \
+  socat \
   ssh \
   wget \
   xz-utils \