feat: docker image

Dockerfile

@@ -0,0 +1,15 @@
+FROM ruby:bookworm
+WORKDIR /license-generator
+COPY ./ ./
+RUN <<EOF
+gem install gitlab-license
+EOF
+VOLUME /license-generator/build
+ENV LICENSE_NAME="Tim Cook"
+ENV LICENSE_COMPANY="Apple Computer, Inc."
+ENV LICENSE_EMAIL="tcook@apple.com"
+ENV LICENSE_PLAN="ultimate"
+ENV LICENSE_USER_COUNT="2147483647"
+ENV LICENSE_EXPIRE_YEAR="2500"
+
+CMD [ "./make.sh" ]