fix(docker): install procps in Docker image (#7032)

Adds procps to apt-get install in Dockerfile, enabling ps/pgrep/pkill inside the container. Contributed by @HiddenPuppy.

Dockerfile

@@ -6,7 +6,7 @@ ENV PYTHONUNBUFFERED=1
 # Install system dependencies in one layer, clear APT cache
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
-        build-essential nodejs npm python3 python3-pip ripgrep ffmpeg gcc python3-dev libffi-dev && \
+        build-essential nodejs npm python3 python3-pip ripgrep ffmpeg gcc python3-dev libffi-dev procps && \
     rm -rf /var/lib/apt/lists/*
 
 COPY . /opt/hermes