Simplify and tweak docker builds for example app

.dockerignore

@@ -1,8 +1,17 @@
-.git
-.mypy_cache
-.pytest_cache
-.ruff_cache
-target
+**/*
+!rust-toolchain.toml
+!Cargo.toml
+!Cargo.lock
+!.cargo
+!crates
+!proto
+!python
+!core-python
+!scripts
+!README.md
+
+!example_app
+
 **/__pycache__
 *.pyc
 *.pyo

example_app/Dockerfile

@@ -1,22 +1,19 @@
 # syntax=docker/dockerfile:1.7
 
-# =============================================================================
-# Stage 1: cargo-chef planner - analyze dependencies
-# =============================================================================
-FROM rust:1.88-bookworm AS planner
+FROM rust:1.88-bookworm AS rust-base
+WORKDIR /repo
+COPY rust-toolchain.toml .
+RUN rustup toolchain install
+
+FROM rust-base AS rust-base-chef
 RUN cargo install cargo-chef --locked
+
+FROM rust-base-chef AS rust-planner
 WORKDIR /repo
-COPY Cargo.toml Cargo.lock build.rs /repo/
-COPY src /repo/src
-COPY proto /repo/proto
-COPY waymark-observability-macros /repo/waymark-observability-macros
+COPY . .
 RUN cargo chef prepare --recipe-path recipe.json
 
-# =============================================================================
-# Stage 2: cargo-chef cook - build dependencies (cached layer)
-# =============================================================================
-FROM rust:1.88-bookworm AS cacher
-
+FROM rust-base-chef AS rust-builder
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install -y --no-install-recommends \
     pkg-config \
@@ -26,48 +23,27 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     protobuf-compiler \
     && rm -rf /var/lib/apt/lists/*
 
-RUN cargo install cargo-chef --locked
-WORKDIR /repo
-COPY --from=planner /repo/recipe.json recipe.json
-# Build dependencies - this layer is cached unless Cargo.toml/Cargo.lock change
+FROM rust-builder AS rust-cacher
+COPY --from=rust-planner /repo/recipe.json recipe.json
 RUN --mount=type=cache,target=/root/.cargo/registry \
     --mount=type=cache,target=/root/.cargo/git \
     cargo chef cook --release --recipe-path recipe.json
 
-# =============================================================================
-# Stage 3: Build the actual binaries (fast - deps already compiled)
-# =============================================================================
-FROM rust:1.88-bookworm AS wheel-builder
-
-ENV DEBIAN_FRONTEND=noninteractive
+FROM rust-builder AS wheel-builder
 RUN apt-get update && apt-get install -y --no-install-recommends \
     python3 \
     python3-venv \
     python3-pip \
     curl \
-    pkg-config \
-    libssl-dev \
-    build-essential \
-    libprotobuf-dev \
-    protobuf-compiler \
     && rm -rf /var/lib/apt/lists/*
 RUN curl -LsSf https://astral.sh/uv/install.sh | sh
 ENV PATH="/root/.local/bin:${PATH}"
 
-WORKDIR /repo
-
 # Copy cached dependencies from cacher stage
-COPY --from=cacher /repo/target target
+COPY --from=rust-cacher /repo/target target
 
 # Copy source files
-COPY Cargo.toml Cargo.lock build.rs README.md /repo/
-COPY src /repo/src
-COPY proto /repo/proto
-COPY waymark-observability-macros /repo/waymark-observability-macros
-COPY python /repo/python
-COPY scripts /repo/scripts
-COPY templates /repo/templates
-COPY migrations /repo/migrations
+COPY . .
 
 # Build - only recompiles your code, not dependencies
 RUN --mount=type=cache,target=/root/.cargo/registry \
@@ -92,7 +68,7 @@ WORKDIR /app
 COPY example_app /app
 
 # Copy templates for the webapp dashboard
-COPY templates /app/templates
+COPY crates/waymark/templates /app/templates
 
 RUN uv venv /opt/venv
 ENV VIRTUAL_ENV=/opt/venv