Add healthcheck

This checks if status.php returns succesfully to determine if the
Nextcloud instance is health.

Signed-off-by: Sylvia van Os <sylvia@hackerchick.me>

Dockerfile-alpine.template

@@ -129,5 +129,6 @@ RUN set -ex; \
 COPY *.sh upgrade.exclude /
 COPY config/* /usr/src/nextcloud/config/
 
+HEALTHCHECK CMD ["curl", "--fail", "http://localhost/status.php"]
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["%%CMD%%"]

Dockerfile-debian.template

@@ -147,5 +147,6 @@ RUN set -ex; \
 COPY *.sh upgrade.exclude /
 COPY config/* /usr/src/nextcloud/config/
 
+HEALTHCHECK CMD ["curl", "--fail", "http://localhost/status.php"]
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["%%CMD%%"]