feat(docker): add entrypoint script to goreleaser Dockerfile

- entrypoint.sh: on first run (config and workspace both absent) runs
  picoclaw onboard then exits for the user to configure; subsequent
  starts exec picoclaw gateway directly
- Dockerfile.goreleaser: copy and use entrypoint.sh, run as root
- .goreleaser.yaml: update dockerfile path, add entrypoint.sh to
  extra_files so it is included in the docker build context

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

.goreleaser.yaml

@@ -39,7 +39,9 @@ builds:
 
 dockers_v2:
   - id: picoclaw
-    dockerfile: Dockerfile.goreleaser
+    dockerfile: docker/Dockerfile.goreleaser
+    extra_files:
+      - docker/entrypoint.sh
     ids:
       - picoclaw
     images:

docker/Dockerfile.goreleaser

@@ -5,6 +5,8 @@ ARG TARGETPLATFORM
 RUN apk add --no-cache ca-certificates tzdata
 
 COPY $TARGETPLATFORM/picoclaw /usr/local/bin/picoclaw
+COPY docker/entrypoint.sh /entrypoint.sh
 
-ENTRYPOINT ["picoclaw"]
-CMD ["gateway"]
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

docker/entrypoint.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+set -e
+
+# First-run: neither config nor workspace exists.
+# If config.json is already mounted but workspace is missing we skip onboard to
+# avoid the interactive "Overwrite? (y/n)" prompt hanging in a non-TTY container.
+if [ ! -d "${HOME}/.picoclaw/workspace" ] && [ ! -f "${HOME}/.picoclaw/config.json" ]; then
+    picoclaw onboard
+    echo ""
+    echo "First-run setup complete."
+    echo "Edit ${HOME}/.picoclaw/config.json (add your API key, etc.) then restart the container."
+    exit 0
+fi
+
+exec picoclaw gateway "$@"