chore: add multi-arch docker build

.dockerignore

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+.git
+.github
+.dockerignore
+Dockerfile
+target
+.env
+*.md
+.DS_Store

Dockerfile

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+# syntax=docker/dockerfile:1.7
+FROM --platform=$BUILDPLATFORM rust:1.94-trixie AS chef
+
+ARG BUILDARCH
+ARG TARGETARCH
+
+WORKDIR /app
+
+RUN if [ "$TARGETARCH" = "arm64" ] && [ "$BUILDARCH" != "arm64" ]; then \
+        apt-get update && apt-get install -y --no-install-recommends \
+            gcc-aarch64-linux-gnu \
+            g++-aarch64-linux-gnu \
+            libc6-dev-arm64-cross \
+            pkg-config && \
+        rustup target add aarch64-unknown-linux-gnu && \
+        rm -rf /var/lib/apt/lists/*; \
+    elif [ "$TARGETARCH" = "amd64" ] && [ "$BUILDARCH" != "amd64" ]; then \
+        apt-get update && apt-get install -y --no-install-recommends \
+            gcc-x86-64-linux-gnu \
+            g++-x86-64-linux-gnu \
+            libc6-dev-amd64-cross \
+            pkg-config && \
+        rustup target add x86_64-unknown-linux-gnu && \
+        rm -rf /var/lib/apt/lists/*; \
+    fi
+
+ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc \
+    CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc \
+    CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=x86_64-linux-gnu-gcc \
+    CC_x86_64_unknown_linux_gnu=x86_64-linux-gnu-gcc
+
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    cargo install cargo-chef --locked
+
+RUN if [ "$TARGETARCH" = "$BUILDARCH" ]; then \
+        echo '--release --locked' > /tmp/cargo-args && \
+        echo 'target/release/pokedex-api' > /tmp/binary-path; \
+    elif [ "$TARGETARCH" = "arm64" ]; then \
+        echo '--release --locked --target aarch64-unknown-linux-gnu' > /tmp/cargo-args && \
+        echo 'target/aarch64-unknown-linux-gnu/release/pokedex-api' > /tmp/binary-path; \
+    elif [ "$TARGETARCH" = "amd64" ]; then \
+        echo '--release --locked --target x86_64-unknown-linux-gnu' > /tmp/cargo-args && \
+        echo 'target/x86_64-unknown-linux-gnu/release/pokedex-api' > /tmp/binary-path; \
+    fi
+
+FROM chef AS planner
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM chef AS builder
+COPY --from=planner /app/recipe.json recipe.json
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    --mount=type=cache,target=/app/target \
+    cargo chef cook $(cat /tmp/cargo-args) --recipe-path recipe.json
+
+COPY Cargo.toml Cargo.lock ./
+COPY src/ src/
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    --mount=type=cache,target=/app/target \
+    cargo build $(cat /tmp/cargo-args) --bin pokedex-api && \
+    cp $(cat /tmp/binary-path) /usr/local/bin/pokedex-api
+
+FROM debian:trixie-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates curl \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /usr/local/bin/pokedex-api /usr/local/bin/pokedex-api
+
+ARG GIT_SHA=unknown
+ENV GIT_SHA=$GIT_SHA \
+    BIND_ADDR=0.0.0.0:5000
+
+EXPOSE 5000
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD curl -fsS http://127.0.0.1:5000/health || exit 1
+
+CMD ["pokedex-api"]