Add Dockerfile

Dockerfile

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+FROM rust:alpine AS builder
+
+RUN rustup default nightly
+
+RUN apk add --no-cache musl-dev
+
+WORKDIR /app
+
+COPY Cargo.toml Cargo.lock ./
+
+RUN mkdir src && \
+    echo "fn main() {}" > src/main.rs && \
+    cargo build --release && \
+    rm -rf src
+
+COPY src ./src
+COPY html ./html
+
+RUN cargo build --release
+
+FROM scratch
+COPY --from=builder /app/target/release/spotify-top-songs-playlist /spotify-top-songs-playlist
+COPY --from=builder /lib/ld-musl-x86_64.so.1 /lib/ld-musl-x86_64.so.1
+
+ENTRYPOINT ["/spotify-top-songs-playlist"]
+
+