Update integration tests and update dev environment (#152)

.devcontainer/prepare-local-addon.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Remove an add-on's registry image before the Supervisor starts so it must
+# build the current checkout's Dockerfile.
+
+set -euo pipefail
+
+config="${1:-config.json}"
+
+if [ ! -f "$config" ]; then
+  echo "ERROR: Add-on config not found: ${config}" >&2
+  exit 1
+fi
+
+if ! jq empty "$config"; then
+  echo "ERROR: Invalid add-on config: ${config}" >&2
+  exit 1
+fi
+
+if jq -e 'has("image")' "$config" > /dev/null; then
+  temporary_config=$(mktemp "${config}.XXXXXX")
+  trap 'rm -f "$temporary_config"' EXIT
+
+  jq 'del(.image)' "$config" > "$temporary_config"
+  mv "$temporary_config" "$config"
+fi
+
+if jq -e 'has("image")' "$config" > /dev/null; then
+  echo "ERROR: Failed to remove image from ${config}" >&2
+  exit 1
+fi
+
+echo "Registry image disabled; the Supervisor will build the current checkout"