build(docker): add Dockerfile

Dockerfile

@@ -0,0 +1,22 @@
+FROM php:7.4-cli-alpine
+
+COPY --from=composer:1 /usr/bin/composer /usr/bin/composer
+
+WORKDIR /app
+
+RUN adduser --disabled-password app \
+  && chown app:app -R /app
+
+USER app
+
+COPY --chown=app:app bin bin
+COPY --chown=app:app config config
+COPY --chown=app:app public public
+COPY --chown=app:app src src
+COPY --chown=app:app .env composer.* ./
+
+RUN composer install
+
+COPY --chown=app:app . .
+
+ENTRYPOINT ["sh"]