refactor: mount plugins and config instead of baking into image

Image now contains only the derp package. Config and plugins are
bind-mounted at runtime, enabling live edits without rebuilds.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Containerfile

@@ -7,7 +7,4 @@ COPY src/ src/
 
 RUN pip install --no-cache-dir .
 
-COPY plugins/ plugins/
-COPY config/derp.toml.example config/derp.toml.example
-
 ENTRYPOINT ["derp"]

Makefile

@@ -42,9 +42,10 @@ link: install ## Symlink to ~/.local/bin
 build: ## Build container image
 	podman build -t $(APP_NAME) .
 
-container-run: ## Run bot in container (mount config)
+container-run: ## Run bot in container (mount config + plugins)
 	podman run -d --name $(APP_NAME) \
 		-v ./config/derp.toml:/app/config/derp.toml:ro,Z \
+		-v ./plugins:/app/plugins:ro,Z \
 		$(APP_NAME)
 
 container-stop: ## Stop and remove container