Added Dockerfile

Dockerfile

@@ -0,0 +1,31 @@
+FROM python:3.11-slim
+
+# Install system dependencies (make, pip) as per README
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    make \
+    python3-pip \
+    python3-venv \
+    && rm -rf /var/lib/apt/lists/*
+
+# Ensure local bin is in PATH (for aliases) as per README
+ENV PATH="/root/.local/bin:$PATH"
+
+# Create and activate a virtual environment
+ENV VIRTUAL_ENV=/root/.venvs/pkgmgr
+RUN python3 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
+# Copy local package-manager source into the image
+WORKDIR /root/Repositories/github.com/kevinveenbirkenbach/package-manager
+COPY . .
+
+# Install Python dependencies and set up the tool non-interactively
+RUN pip install --upgrade pip \
+    && pip install PyYAML \
+    && chmod +x main.py \
+    && python main.py install package-manager --no-verification --quiet
+
+# Default entrypoint for pkgmgr
+ENTRYPOINT ["pkgmgr"]
+CMD ["--help"]

README.md

@@ -51,6 +51,20 @@ The `make setup` command will:
 - Install required packages from `requirements.txt`.
 - Execute `python main.py install` to complete the installation.
 
+## Docker Quickstart 🐳
+
+Alternatively to installing locally, you can use Docker: build the image with
+
+```bash
+docker build --no-cache -t pkgmgr .
+```
+
+and then run
+
+```bash
+docker run --rm pkgmgr --help
+```
+
 ## Usage 📖
 
 Run the script with different commands. For example: