add docker files

docker/entrypoint.sh

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+#!/bin/sh
+if [ -n "$GITHUB_TOKEN" ] || grep -q "TOKEN=" "$GITHUB_README_STREAK_STATS_PATH/.env"; then
+  echo "TOKEN=$GITHUB_TOKEN" > $GITHUB_README_STREAK_STATS_PATH/.env
+else
+  echo "Error: GITHUB_TOKEN is not set or is empty. Please provide a value for the ENV variable GITHUB_TOKEN or create a valid .env file."
+  exit 1
+fi
+
+composer start

dockerfile

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+FROM ubuntu:latest
+ENV GITHUB_TOKEN="" \
+    TZ="Etc/UTC" \
+    GITHUB_README_STREAK_STATS_PATH=/mnt/github-readme-streak-stats
+ARG DEBIAN_FRONTEND=noninteractive
+COPY . $GITHUB_README_STREAK_STATS_PATH
+WORKDIR $GITHUB_README_STREAK_STATS_PATH
+RUN apt-get update && \
+    apt-get install -y php php-curl php-xml composer inkscape
+RUN composer install
+EXPOSE 8000
+RUN chmod +x $GITHUB_README_STREAK_STATS_PATH/docker/entrypoint.sh
+#Uncomment CMD and comment out ENTRYPOINT for debugging of the image
+#CMD ["tail", "-f", "/dev/null"]
+ENTRYPOINT [ "./docker/entrypoint.sh" ]

docs/docker.md

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+# Build docker image
+Build the image by running the following command in the reporoot.
+```bash
+docker build -t github-readme-streak-stats . --progress plain
+```
+# Create docker container
+After building the image, you can run it by using either `docker run` or `docker compose`.
+## Docker run
+```bash
+docker run --name github-streak -p 8000:8000 -e GITHUB_TOKEN=YOUR_GITHUB_TOKEN_HERE github-readme-streak-stats
+```
+## Docker compose
+```yml
+version: '3'
+services:
+  github-streak:
+    container_name: github-streak
+    image: github-readme-streak-stats
+    ports:
+     - 8000:8000
+    environment:
+     - GITHUB_TOKEN=YOUR_GITHUB_TOKEN_HERE
+```