Restored default Dockerfile

packages/backend/Dockerfile

@@ -9,21 +9,20 @@
 #
 # Once the commands have been run, you can build the image using `yarn build-image`
 
-FROM node:18-bookworm-slim
+FROM node:16-bullseye-slim
 
 # Install isolate-vm dependencies, these are needed by the @backstage/plugin-scaffolder-backend.
 RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
     --mount=type=cache,target=/var/lib/apt,sharing=locked \
-    apt-get update -y \
-    && apt-get install -y --no-install-recommends python3 g++ build-essential \
-    && yarn config set python /usr/bin/python3
+    apt-get update && \
+    apt-get install -y --no-install-recommends python3 g++ build-essential && \
+    yarn config set python /usr/bin/python3
 
 # Install sqlite3 dependencies. You can skip this if you don't use sqlite3 in the image,
 # in which case you should also move better-sqlite3 to "devDependencies" in package.json.
 RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
     --mount=type=cache,target=/var/lib/apt,sharing=locked \
-    && apt-get update -y \
-    && apt-get install -y --no-install-recommends libsqlite3-dev
+    apt-get install -y --no-install-recommends libsqlite3-dev
 
 # From here on we use the least-privileged `node` user to run the backend.
 USER node