fix: copy missing files in Dockerfile to fix build (#322)

* fix: copy missing files in Dockerfile to fix build

The Docker build failed because Cargo.toml references files that were
not copied into the builder stage:

1. tests/html_to_markdown.rs — declared as [[test]] in Cargo.toml,
   Cargo validates the path exists even when only building a binary.
2. build.rs — auto-discovered build script that embeds registry
   manifests at compile time via include_str!(env!("OUT_DIR")).
3. registry/ — contains extension manifests read by build.rs to
   generate the embedded catalog.

Added COPY directives for build.rs, tests/, and registry/.

Fixes nearai/ironclaw#320

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* Address serrrfirat review feedback on WASM channel omission

- Add Dockerfile comment documenting that channels-src/ is intentionally
  omitted since WASM compilation requires wasm32-wasip2 and wasm-tools
  which are not installed in the builder stage

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* Add WASM channel compilation support to Docker build

- Copy channels-src/ into builder stage for Telegram/Slack/Discord/WhatsApp
- Install wasm32-wasip2 target and wasm-tools so build.rs can compile
  WASM channel components instead of silently skipping them

Co-Authored-By: Claude Opus 4.6 <[email protected]>

---------

Co-authored-by: Claude Opus 4.6 <[email protected]>

Dockerfile

@@ -11,16 +11,22 @@ FROM rust:1.92-slim-bookworm AS builder
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     pkg-config libssl-dev cmake gcc g++ \
-    && rm -rf /var/lib/apt/lists/*
+    && rm -rf /var/lib/apt/lists/* \
+    && rustup target add wasm32-wasip2 \
+    && cargo install wasm-tools
 
 WORKDIR /app
 
 # Copy manifests first for layer caching
 COPY Cargo.toml Cargo.lock ./
 
-# Copy source and build artifacts
+# Copy source, build script, tests, and supporting directories
+COPY build.rs build.rs
 COPY src/ src/
+COPY tests/ tests/
 COPY migrations/ migrations/
+COPY registry/ registry/
+COPY channels-src/ channels-src/
 COPY wit/ wit/
 
 RUN cargo build --release --bin ironclaw