feat: add psql, redis-cli, helm, k9s to devpod image

Dockerfile.devpod

@@ -8,6 +8,7 @@ ENV PATH="/root/.bun/bin:$PATH"
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl wget git openssh-server ca-certificates gnupg \
     build-essential unzip jq tmux zsh ripgrep \
+    postgresql-client redis-tools \
     && rm -rf /var/lib/apt/lists/*
 
 # Bun
@@ -27,6 +28,13 @@ RUN curl -fsSL "https://dl.k8s.io/release/$(curl -fsSL https://dl.k8s.io/release
 RUN curl -fsSL https://github.com/digitalocean/doctl/releases/download/v1.119.0/doctl-1.119.0-linux-amd64.tar.gz \
     | tar xz -C /usr/local/bin
 
+# helm
+RUN curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
+
+# k9s
+RUN curl -fsSL https://github.com/derailed/k9s/releases/latest/download/k9s_Linux_amd64.tar.gz \
+    | tar xz -C /usr/local/bin k9s
+
 # SSH setup — host keys generated at runtime via entrypoint
 RUN mkdir -p /run/sshd /root/.ssh && chmod 700 /root/.ssh