Record the connectors and what is still read-only

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011LF61rxW1FG5YCD2J9YqjY

backend/Dockerfile

@@ -40,6 +40,15 @@ RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
     uv sync --frozen --package app
 
+# Connectors are ordinary installed packages found through the
+# `fluksio.node_types` entry point. `make connectors` builds them into here;
+# an image with none is the normal case.
+COPY ./backend/connector-wheels /tmp/connector-wheels
+RUN --mount=type=cache,target=/root/.cache/uv \
+    sh -c 'ls /tmp/connector-wheels/*.whl >/dev/null 2>&1 \
+      && uv pip install --python /app/.venv/bin/python /tmp/connector-wheels/*.whl \
+      || echo "no connectors bundled"'
+
 WORKDIR /app/backend/
 
 # Single worker on purpose: the process hosts the flow engine, and a second

backend/connector-wheels/.gitignore

@@ -0,0 +1 @@
+*.whl

backend/connector-wheels/.gitkeep

@@ -0,0 +1,3 @@
+Connector wheels built by `make connectors` at the workspace root land here and
+are installed into the image. Kept empty in git: a connector is an installed
+package, not part of the app.