add dockerfile

Dockerfile

@@ -0,0 +1,19 @@
+FROM alpine:3
+
+# hadolint ignore=DL3018
+RUN apk add --no-cache docker-cli bash tini
+
+ENV NEXTCLOUD_EXEC_USER=www-data
+ENV NEXTCLOUD_CONTAINER_NAME=
+ENV NEXTCLOUD_PROJECT_NAME=
+ENV NEXTCLOUD_CRON_MINUTE_INTERVAL=15
+ENV NEXTCLOUD_EXEC_SHELL=bash
+ENV NEXTCLOUD_EXEC_SHELL_ARGS=-c
+
+COPY scripts/*.sh /
+COPY scripts/cron-scripts-builtin /cron-scripts-builtin
+
+ENTRYPOINT ["tini", "--", "/entrypoint.sh"]
+
+HEALTHCHECK --timeout=5s \
+    CMD ["/healthcheck.sh"]