Reminder to keep sha1sum file in sync
diff --git a/Dockerfile b/Dockerfile
index f723fc0..320d6f3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,8 +4,12 @@
# build on top of the released Launchpad
RUN mkdir -p /opt/sling
RUN wget https://repo1.maven.org/maven2/org/apache/sling/org.apache.sling.starter/10/org.apache.sling.starter-10.jar -O /opt/sling/org.apache.sling.starter.jar
+
+# sha1sum.txt must be updated when switching to a different jar,
+# or docker build will fail
COPY sha1sum.txt /tmp
RUN sha1sum -c /tmp/sha1sum.txt
+
WORKDIR /opt/sling/
EXPOSE 8080
VOLUME /opt/sling/sling
