feat(opencode): add gemini auth bootstrap

Add opencode configuration and npm dependency so the gemini auth plugin
is installed with the feature by default. Require the node feature and
run the on-create hook to guarantee npm is present and emit setup status
as the container initializes.

Signed-off-by: Svetlin Ralchev <iamralch@users.noreply.github.com>

Author: iamralch

src/opencode/devcontainer-feature.json

@@ -12,6 +12,8 @@
     }
   },
   "installsAfter": [
-    "ghcr.io/devcontainers/features/common-utils"
-  ]
+    "ghcr.io/devcontainers/features/common-utils",
+    "ghcr.io/devcontainers/features/node"
+  ],
+  "onCreateCommand": "/etc/opencode/hooks/on-create.sh"
 }

src/opencode/files/opencode.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": [
+    "opencode-gemini-auth"
+  ]
+}

src/opencode/hooks/on-create.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+
+CONFIG_PATH="$HOME/.config/opencode"
+# Make sure that the configuration directory exists
+mkdir -p "$CONFIG_PATH"
+# Copy the system-wide configuration as a user configuration
+cp /etc/opencode/opencode.json "$CONFIG_PATH/opencode.json"
+# Make sure that user has correct permissions
+chown -R "$(id -u):$(id -g)" "${CONFIG_PATH}"

src/opencode/install.sh

@@ -2,17 +2,17 @@
 set -e
 
 apt_get_update() {
-  if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
-    echo "Running apt-get update..."
-    apt-get update -y
-  fi
+	if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+		echo "Running apt-get update..."
+		apt-get update -y
+	fi
 }
 
 # Checks if packages are installed and installs them if not
 apt_get() {
-  if ! dpkg -s "$@" >/dev/null 2>&1; then
-    apt-get -y install --no-install-recommends "$@"
-  fi
+	if ! dpkg -s "$@" >/dev/null 2>&1; then
+		apt-get -y install --no-install-recommends "$@"
+	fi
 }
 
 apt_get_update
@@ -26,3 +26,13 @@ curl -fsSL https://opencode.ai/install | bash
 
 # Make opencode available for everybody
 mv "$HOME/.opencode/bin/opencode" /usr/local/bin/opencode
+
+# Create the global config
+mkdir -p /etc/opencode/hooks
+
+# Copy the configuration
+cp -R files/* /etc/opencode
+cp -R hooks/* /etc/opencode/hooks
+
+# Install opencode-gemini-auth
+npm install -g opencode-gemini-auth