🐳Build a scratch docker image

Dockerfile

@@ -2,31 +2,35 @@ FROM rust:1.84.1-slim-bookworm AS builder
 
 WORKDIR /usr/src/app
 
+# Install musl-tools for static linking
+RUN apt-get update && apt-get install -y musl-tools && rm -rf /var/lib/apt/lists/*
+
+# Set the target to musl for static linking with ARM64
+RUN rustup target add aarch64-unknown-linux-musl
+
 # Copy the Cargo files to cache dependencies
 COPY Cargo.toml Cargo.lock ./
 
 # Create a dummy main.rs to build dependencies
 RUN mkdir src && \
     echo 'fn main() { println!("Dummy") }' > src/main.rs && \
-    cargo build --release && \
+    cargo build --release --target aarch64-unknown-linux-musl && \
     rm src/main.rs
 
 # Now copy the actual source code
 COPY src ./src
 
-# Build for release
-RUN touch src/main.rs && cargo build --release
+# Build for release with static linking
+RUN touch src/main.rs && \
+    cargo build --release --target aarch64-unknown-linux-musl
 
 # Runtime stage
-FROM debian:bookworm-slim
-
-# Install minimal runtime dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
+FROM scratch
 
 # Copy the build artifact from the build stage
-COPY --from=builder /usr/src/app/target/release/spf-check /usr/local/bin/
+COPY --from=builder /usr/src/app/target/aarch64-unknown-linux-musl/release/spf-check /spf-check
 
 EXPOSE 8080
 
 # Set the startup command to run our binary
-CMD ["spf-check"]
+CMD ["/spf-check"]