feat: add project fork async job service with cli prune/clear commands and shared container image build target

devplacepy/config.py

@@ -1,4 +1,3 @@
-import tempfile
 from pathlib import Path
 from dotenv import load_dotenv
 from os import environ
@@ -24,10 +23,10 @@ SERVICE_LOCK_FILE = BASE_DIR / "devplace-services.lock"
 INIT_LOCK_FILE = BASE_DIR / "devplace-init.lock"
 
 # Container data lives OUTSIDE the package (never served via /static, never watched by --reload).
-# Build contexts are ephemeral, so they go in the OS temp dir; workspaces are persistent.
 DATA_DIR = Path(environ.get("DEVPLACE_DATA_DIR", str(BASE_DIR / "var")))
 CONTAINER_WORKSPACES_DIR = DATA_DIR / "container_workspaces"
-CONTAINER_BUILD_CONTEXTS_DIR = Path(tempfile.gettempdir()) / "devplace_build_contexts"
+# Every container instance runs this one prebuilt image (built once via `make ppy`).
+CONTAINER_IMAGE = environ.get("DEVPLACE_CONTAINER_IMAGE", "ppy:latest")
 # Host the /p/<slug> ingress proxy dials to reach a published container port.
 CONTAINER_PROXY_HOST = environ.get("DEVPLACE_CONTAINER_PROXY_HOST", "127.0.0.1")