feat(dev): add local dockerized ci workflow (#342)

Dockerfile

@@ -14,14 +14,18 @@ RUN apt-get update && apt-get install -y \
 COPY Cargo.toml Cargo.lock ./
 # Create dummy main.rs to build dependencies
 RUN mkdir src && echo "fn main() {}" > src/main.rs
-RUN cargo build --release --locked
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    cargo build --release --locked
 RUN rm -rf src
 
 # 2. Copy source code
 COPY . .
 # Touch main.rs to force rebuild
 RUN touch src/main.rs
-RUN cargo build --release --locked && \
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    cargo build --release --locked && \
     strip target/release/zeroclaw
 
 # ── Stage 2: Permissions & Config Prep ───────────────────────