Add containerfile

Containerfile

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+# Build backend
+FROM rust:1.82-alpine3.20 as build_backend
+
+RUN apk add musl-dev
+
+WORKDIR /
+
+COPY Cargo.* ./
+
+COPY migration migration/
+
+COPY src src/
+
+RUN cargo build --release
+
+# End container
+FROM alpine:3.20
+
+WORKDIR /
+
+COPY --from=build_backend target/release/mailauth .
+
+ENTRYPOINT ["./mailauth"]