Add Axum backend experiment

alt/rust/Dockerfile

@@ -0,0 +1,22 @@
+# Build from the repository root: docker build -f alt/rust/Dockerfile -t ytplayer-rust .
+FROM rust:1-bookworm AS builder
+WORKDIR /build
+COPY alt/rust/Cargo.toml alt/rust/Cargo.lock ./
+COPY alt/rust/src ./src
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    --mount=type=cache,target=/build/target \
+    cargo build --release && cp target/release/ytplayer-rust-backend /tmp/ytplayer-rust-backend
+
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl ffmpeg python3 python3-pip \
+    && pip3 install --break-system-packages --no-cache-dir yt-dlp \
+    && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY --from=builder /tmp/ytplayer-rust-backend /usr/local/bin/ytplayer-rust-backend
+COPY frontend/ /app/public/
+RUN mkdir -p /app/data/media
+ENV PORT=3000 PUBLIC_DIR=/app/public DB_PATH=/app/data/ytplayer.db MEDIA_DIR=/app/data/media \
+    MEDIA_CACHE_MAX_BYTES=10737418240 YTDLP_PATH=/usr/local/bin/yt-dlp FFMPEG_PATH=/usr/bin/ffmpeg FFPROBE_PATH=/usr/bin/ffprobe
+EXPOSE 3000
+ENTRYPOINT ["/usr/local/bin/ytplayer-rust-backend"]