chore: install opencode in ddev container for security reasons

.ddev/addon-metadata/opencode/manifest.yaml

@@ -0,0 +1,11 @@
+name: opencode
+repository: /Users/fromme/Development/Misc/ddev-opencode
+version: ""
+install_date: "2026-01-05T16:57:43+01:00"
+project_files:
+    - web-build/Dockerfile.opencode
+    - commands/web/opencode
+    - config.opencode.yaml
+    - opencode/.gitignore
+global_files: []
+removal_actions: []

.ddev/commands/web/opencode

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+#!/bin/bash
+#ddev-generated
+
+## Description: OpenCode AI coding assistant
+## Usage: opencode
+## Example: ddev opencode [...]
+
+set -e
+
+opencode $@
+

.ddev/config.opencode.yaml

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+#ddev-generated
+webimage_extra_packages:
+  - xdg-utils
+hooks:
+  post-start:
+    - exec: "mkdir -p /var/www/html/.ddev/opencode/.opencode && ln -sf /var/www/html/.ddev/opencode/.opencode ~/.opencode"

.ddev/opencode/.gitignore

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+#ddev-generated
+
+# OpenCode internal config
+/.opencode/
+

.ddev/web-build/Dockerfile.opencode

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+#ddev-generated
+
+RUN npm install -g opencode-ai
+