tsk-42: Adding initial docker file

Dockerfile

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+# Stage 1: Build the application
+# Use a specific Rust version for reproducibility. Choose one that matches your development environment.
+# Using slim variant for smaller base image
+FROM rust:1.88 as builder
+
+# Set the working directory inside the container
+WORKDIR /usr/src/app
+
+# Install build dependencies if needed (e.g., git for cloning)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    pkg-config libssl3 \
+    ca-certificates \
+    openssh-client git \
+    && rm -rf /var/lib/apt/lists/*
+
+# << --- ADD HOST KEY HERE --- >>
+# Replace 'yourgithost.com' with the actual hostname (e.g., github.com)
+RUN mkdir -p -m 0700 ~/.ssh && \
+    ssh-keyscan git.kundeng.us >> ~/.ssh/known_hosts
+
+# Copy Cargo manifests
+COPY Cargo.toml Cargo.lock ./
+
+# Build *only* dependencies to leverage Docker cache
+# This dummy build caches dependencies as a separate layer
+RUN --mount=type=ssh mkdir src && \
+    echo "fn main() {println!(\"if you see this, the build broke\")}" > src/main.rs && \
+    cargo build --release --quiet && \
+    rm -rf src target/release/deps/songparser* # Clean up dummy build artifacts (replace songparser)
+
+# Copy the actual source code
+COPY src ./src
+# If you have other directories like `templates` or `static`, copy them too
+COPY .env ./.env
+
+# << --- SSH MOUNT ADDED HERE --- >>
+# Build *only* dependencies to leverage Docker cache
+# This dummy build caches dependencies as a separate layer
+# Mount the SSH agent socket for this command
+RUN --mount=type=ssh \
+    cargo build --release --quiet
+
+# Stage 2: Create the final, smaller runtime image
+# Use a minimal base image like debian-slim or even distroless for security/size
+FROM ubuntu:24.04
+
+# Install runtime dependencies if needed (e.g., SSL certificates)
+RUN apt-get update && apt-get install -y ca-certificates libssl-dev libssl3 && rm -rf /var/lib/apt/lists/*
+
+# Set the working directory
+WORKDIR /usr/local/bin
+
+# Copy the compiled binary from the builder stage
+# Replace 'songparser' with the actual name of your binary (usually the crate name)
+COPY --from=builder /usr/src/app/target/release/songparser .
+
+# Copy other necessary files like .env (if used for runtime config) or static assets
+# It's generally better to configure via environment variables in Docker though
+COPY --from=builder /usr/src/app/.env .
+
+# Expose the port your Axum app listens on (e.g., 3000 or 8000)
+EXPOSE 3002
+
+# Set the command to run your application
+# Ensure this matches the binary name copied above
+CMD ["./songparser"]