feat(wfe-server): gRPC reflection, auto-generated schema endpoints, Dockerfile

- tonic-reflection for gRPC service discovery
  - /schema/workflow.json (JSON Schema from schemars derives)
  - /schema/workflow.yaml (same schema in YAML)
  - /schema/workflow.proto (raw proto file)
  - Multi-stage alpine Dockerfile with all executor features
  - Comprehensive configuration reference (wfe-server/README.md)
  - Release script (scripts/release.sh)
  - Bumped to 1.8.1

scripts/release.sh

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+VERSION="${1:?Usage: scripts/release.sh <version> [message]}"
+MESSAGE="${2:-v${VERSION}}"
+
+echo "=== Releasing v${VERSION} ==="
+
+# Tag
+git tag -a "v${VERSION}" -m "${MESSAGE}"
+
+# Publish leaf crates
+for crate in wfe-core wfe-containerd-protos wfe-buildkit-protos wfe-server-protos; do
+    echo "--- Publishing ${crate} ---"
+    cargo publish -p "${crate}" --registry sunbeam
+done
+
+# Middle layer
+for crate in wfe-sqlite wfe-postgres wfe-opensearch wfe-valkey wfe-buildkit wfe-containerd wfe-rustlang; do
+    echo "--- Publishing ${crate} ---"
+    cargo publish -p "${crate}" --registry sunbeam
+done
+
+# Top layer (needs index to catch up)
+sleep 10
+for crate in wfe wfe-yaml; do
+    echo "--- Publishing ${crate} ---"
+    cargo publish -p "${crate}" --registry sunbeam
+done
+
+# Final layer
+sleep 10
+for crate in wfe-server wfe-deno wfe-kubernetes; do
+    echo "--- Publishing ${crate} ---"
+    cargo publish -p "${crate}" --registry sunbeam
+done
+
+# Push git
+git push origin mainline
+git push origin "v${VERSION}"
+
+# Create Gitea release from changelog
+release_body=$(awk -v ver="${VERSION}" '/^## \[/{if(found)exit;if(index($0,"["ver"]"))found=1;next}found{print}' CHANGELOG.md)
+tea release create --tag "v${VERSION}" --title "v${VERSION}" --note "${release_body}" || echo "(release already exists)"
+
+# Build + push Docker image
+echo "--- Building Docker image ---"
+docker buildx build --builder sunbeam-remote --platform linux/amd64 \
+    -t "src.sunbeam.pt/studio/wfe:${VERSION}" \
+    -t "src.sunbeam.pt/studio/wfe:latest" \
+    --push .
+
+echo "=== v${VERSION} released ==="