Add init script for demo skill

Installs chrome and rodney

.pi/skills/demo/init.sh

@@ -0,0 +1,132 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# init.sh — Set up the demo skill's headless Chrome container
+#
+# Prerequisites:
+#   - go (for installing showboat & rodney)
+#   - docker
+#
+# This script:
+#   1. Installs showboat and rodney if missing
+#   2. Downloads Chromium for the host (macOS, via rodney)
+#   3. Downloads Chromium for the Docker image (Linux_x64, from GCS)
+#   4. Copies Linux binary into chrome/ (the Docker build context)
+#   5. Builds the demo-chrome image
+
+SKILL_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+CHROME_DIR="$SKILL_DIR/chrome"
+IMAGE_NAME="${1:-demo-chrome}"
+
+echo "==> Checking prerequisites..."
+
+# ------------------------------------------------------------------
+# 1. Install CLI tools
+# ------------------------------------------------------------------
+GO_BIN_DIR="$(go env GOBIN 2>/dev/null || echo "$HOME/go/bin")"
+export PATH="$GO_BIN_DIR:$PATH"
+
+if ! command -v showboat &>/dev/null; then
+  echo "==> Installing showboat..."
+  go install github.com/simonw/showboat@latest
+else
+  echo "    showboat: ok"
+fi
+
+if ! command -v rodney &>/dev/null; then
+  echo "==> Installing rodney..."
+  go install github.com/simonw/rodney@latest
+else
+  echo "    rodney: ok"
+fi
+
+# ------------------------------------------------------------------
+# 2. Download macOS Chromium for local rodney
+# ------------------------------------------------------------------
+echo "==> Downloading macOS Chromium via rodney..."
+rodney start 2>/dev/null || true
+rodney stop  2>/dev/null || true
+
+ROD_CACHE="$HOME/.cache/rod/browser"
+if [ -d "$ROD_CACHE" ]; then
+  CHROMIUM_DIR=$(ls -d "$ROD_CACHE"/chromium-* 2>/dev/null | head -1)
+else
+  echo "ERROR: rod cache not found at $ROD_CACHE"
+  exit 1
+fi
+
+if [ -z "$CHROMIUM_DIR" ]; then
+  echo "ERROR: No chromium-* directory found in $ROD_CACHE"
+  exit 1
+fi
+
+echo "    macOS Chromium at: $CHROMIUM_DIR"
+
+# Extract revision number from directory name (e.g. chromium-1321438)
+REVISION=$(basename "$CHROMIUM_DIR" | sed 's/chromium-//')
+echo "    Revision: $REVISION"
+
+# ------------------------------------------------------------------
+# 3. Download Linux Chromium for the Docker image
+# ------------------------------------------------------------------
+LINUX_ZIP="/tmp/chrome-linux-$REVISION.zip"
+LINUX_EXTRACT="/tmp/chrome-linux-extract"
+
+echo "==> Downloading Linux_x64 Chromium (revision $REVISION)..."
+
+if [ ! -f "$LINUX_ZIP" ]; then
+  curl -fSL \
+    "https://storage.googleapis.com/chromium-browser-snapshots/Linux_x64/$REVISION/chrome-linux.zip" \
+    -o "$LINUX_ZIP"
+  echo "    Downloaded: $LINUX_ZIP"
+else
+  echo "    Already cached: $LINUX_ZIP"
+fi
+
+# ------------------------------------------------------------------
+# 4. Extract and copy into build context
+# ------------------------------------------------------------------
+echo "==> Extracting Linux Chromium into $CHROME_DIR ..."
+rm -rf "$LINUX_EXTRACT" "$CHROME_DIR"
+mkdir -p "$LINUX_EXTRACT"
+unzip -q "$LINUX_ZIP" -d "$LINUX_EXTRACT"
+
+# chrome-linux.zip contains a single chrome-linux/ directory
+mv "$LINUX_EXTRACT/chrome-linux" "$CHROME_DIR"
+
+# IMPORTANT: set suid on the sandbox binary so Chrome can sandbox child processes
+if [ -f "$CHROME_DIR/chrome_sandbox" ]; then
+  chmod 4755 "$CHROME_DIR/chrome_sandbox"
+fi
+
+echo "==> Files in $CHROME_DIR:"
+ls -lh "$CHROME_DIR/" | head -15
+
+# Clean up extraction temp
+rm -rf "$LINUX_EXTRACT"
+
+# ------------------------------------------------------------------
+# 5. Build Docker image
+# ------------------------------------------------------------------
+echo "==> Building Docker image '$IMAGE_NAME' ..."
+docker build --tag "$IMAGE_NAME" "$SKILL_DIR"
+
+# ------------------------------------------------------------------
+# 6. Verify
+# ------------------------------------------------------------------
+echo ""
+echo "==> Success!"
+echo "    Image:  $IMAGE_NAME"
+echo ""
+echo "    Run the container:"
+echo "      docker run -d --name demo-chrome \\"
+echo "        --cap-add=SYS_ADMIN --cap-drop=ALL \\"
+echo "        --security-opt=no-new-privileges:false \\"
+echo "        -p 9222:9222 \\"
+echo "        $IMAGE_NAME"
+echo ""
+echo "    Connect rodney to it:"
+echo "      rodney connect localhost:9222"
+echo ""
+echo "    Stop the container:"
+echo "      docker stop demo-chrome && docker rm demo-chrome"