fix: add /app to container pythonpath (#3972)

Signed-off-by: lucarlig <luca.carlig@ibm.com>

Author: lucarlig

Containerfile

@@ -117,8 +117,10 @@ EXPOSE 4444
 # Set the runtime user
 USER 1001
 
-# Ensure virtual environment binaries are in PATH
-ENV PATH="/app/.venv/bin:$PATH"
+# Ensure virtual environment binaries are in PATH and project modules resolve
+# even when containers run an alternate Python entrypoint.
+ENV PATH="/app/.venv/bin:$PATH" \
+    PYTHONPATH="/app"
 
 # HTTP server selection via HTTP_SERVER environment variable:
 #   - gunicorn : Python-based with Uvicorn workers (default)

Containerfile.lite

@@ -318,6 +318,7 @@ COPY --from=builder --chown=1001:0 /app /app
 # - Disable pip version check to reduce startup time
 # ----------------------------------------------------------------------------
 ENV PATH="/app/.venv/bin:${PATH}" \
+    PYTHONPATH="/app" \
     CONTEXTFORGE_ENABLE_RUST_BUILD=${ENABLE_RUST} \
     CONTEXTFORGE_ENABLE_RUST_MCP_RMCP_BUILD=${ENABLE_RUST_MCP_RMCP} \
     PYTHONDONTWRITEBYTECODE=1 \

Containerfile.scratch

@@ -321,6 +321,7 @@ COPY --from=builder ${ROOTFS_PATH}/ /
 # - Disable pip version check to reduce startup time
 # ----------------------------------------------------------------------------
 ENV PATH="/app/.venv/bin:${PATH}" \
+    PYTHONPATH="/app" \
     PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PYTHONHASHSEED=random \