Add snapshot tests for Fractal

tests/snapshots/output/fractal/Dockerfile

@@ -0,0 +1,20 @@
+FROM node:20-bullseye-slim AS base
+
+WORKDIR /app
+
+RUN mkdir /node_modules \
+  && chown node:node -R /app /node_modules
+
+COPY --chown=node:node package*.json *yarn* /app
+
+USER node
+
+################################################################################
+
+FROM base AS build
+
+RUN yarn install --frozen-lockfile
+
+COPY --chown=node:node . .
+
+CMD ["bash"]