feat: initial fluxer codebase import

fluxer_metrics/Dockerfile

@@ -0,0 +1,41 @@
+FROM rustlang/rust:nightly-slim AS builder
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY Cargo.toml ./
+
+RUN mkdir -p src && echo "fn main() {}" > src/main.rs
+
+RUN cargo build --release 2>/dev/null || true
+
+RUN rm -rf src
+
+COPY src ./src
+
+RUN touch src/main.rs && cargo build --release
+
+FROM debian:bookworm-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /app/target/release/fluxer_metrics /app/fluxer_metrics
+
+RUN useradd -r -s /bin/false fluxer
+USER fluxer
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8080/_health || exit 1
+
+EXPOSE 8080
+
+CMD ["/app/fluxer_metrics"]