feat: add Docker support

This commit adds Docker support to goose via a multi-stage Dockerfile that:
- Uses rust:1.75 for building
- Uses debian:bookworm-slim for runtime
- Includes required system dependencies
- Provides documentation for Docker usage

The Docker image allows running goose without installing Rust locally and
provides a consistent runtime environment.

.github/PULL_REQUEST_TEMPLATE/docker.md

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+# Docker Support for Goose
+
+This PR adds Docker support to make it easier to run goose in containerized environments.
+
+## Changes
+- Adds a Dockerfile that builds goose from source using multi-stage builds
+- Documents Docker usage in README
+
+## Testing Done
+Verified the Docker image builds and runs successfully:
+```bash
+docker build -t goose .
+docker run goose --version  # Outputs: 1.0.4
+```
+
+## Technical Details
+The Dockerfile uses a multi-stage build approach:
+1. Build stage: Uses rust:1.75 to compile the application
+2. Runtime stage: Uses debian:bookworm-slim for a minimal runtime image
+
+Key runtime dependencies are included:
+- libssl3 and ca-certificates for TLS/networking
+- libdbus-1-3 for D-Bus support 
+- libxcb libs for X11 support
+
+## Screenshot
+N/A - CLI tool
+
+## Motivation
+Making goose available as a Docker image provides several benefits:
+1. Consistent runtime environment
+2. Easy deployment in containerized environments
+3. No need to install Rust toolchain for running goose
+
+## Notes
+The final image size could potentially be reduced further using Alpine Linux or scratch images, 
+but this would require cross-compilation support. The current approach prioritizes reliability
+and ease of maintenance.

Dockerfile

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+# Build stage
+FROM rust:1.75 as builder
+
+WORKDIR /usr/src/goose
+COPY . .
+
+# Install required dependencies
+RUN apt-get update && \
+    apt-get install -y pkg-config libssl-dev libdbus-1-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+# Build the application
+RUN cargo build --release
+
+# Runtime stage
+FROM debian:bookworm-slim
+
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apt-get update && \
+    apt-get install -y libssl3 ca-certificates libdbus-1-3 libxcb1 libxcb-render0 libxcb-shape0 libxcb-xfixes0 && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy the binary from builder
+COPY --from=builder /usr/src/goose/target/release/goose /app/goose
+
+# Set the binary as the entrypoint
+ENTRYPOINT ["/app/goose"]

documentation/docker.md

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+## Docker Support
+
+You can run goose using Docker:
+
+```bash
+# Build the image
+docker build -t goose .
+
+# Run goose commands
+docker run goose --version
+docker run goose --help
+```
+
+### Custom Configuration
+You can mount a configuration directory to persist settings:
+```bash
+docker run -v ~/.config/goose:/root/.config/goose goose <command>
+```