Phase 1: CKPool build infrastructure

Forks CKPool-solo at upstream commit cfb0f83b (v1.0) via a multi-stage
Docker build, with an env-driven entrypoint that renders ckpool.conf from
a template. The pinned commit already includes every fix referenced in
Bassin issue #29 (workbase_id double increment, extended low-power
timeouts, configurable dropidle, vardiff burst handling).

No patches are applied yet — the patches/ directory holds the workflow
and build wiring so Kamado-specific patches can be added incrementally.

Build is portable across aarch64/x86_64: yasm is intentionally omitted
so CKPool falls back to its C SHA256, and CFLAGS override drops upstream's
default -march=native. Runtime image ships ckpool and ckpmsg for socket
debugging; share logging (-L) is enabled by default.

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

.gitignore

@@ -0,0 +1,41 @@
+# Build artifacts
+build/
+dist/
+*.o
+*.a
+*.so
+*.tar
+*.tar.gz
+
+# Docker
+docker-images/
+
+# CKPool source (cloned at build time)
+ckpool/src/
+
+# Go
+api/bin/
+api/vendor/
+*.exe
+
+# Node / Svelte
+ui/node_modules/
+ui/.svelte-kit/
+ui/build/
+
+# Runtime / data
+data/
+logs/
+*.log
+*.pid
+
+# Editor
+.vscode/
+.idea/
+*.swp
+*.swo
+.DS_Store
+
+# Environment
+.env
+.env.local