add volume to docker image

changelog/unreleased/docker_image_volume.md

@@ -0,0 +1,7 @@
+Change: Add "volume" declaration to docker images
+
+Tags: docker
+
+Add "volume" declaration to docker images. This makes it easier for Docker users to see where oCIS stores data.
+
+https://github.com/owncloud/ocis/pull/1375

ocis/docker/Dockerfile.linux.amd64

@@ -15,3 +15,5 @@ ENTRYPOINT ["/usr/bin/ocis"]
 CMD ["server"]
 
 COPY bin/ocis /usr/bin/ocis
+
+VOLUME [ "/var/tmp/ocis" ]

ocis/docker/Dockerfile.linux.arm

@@ -15,3 +15,5 @@ ENTRYPOINT ["/usr/bin/ocis"]
 CMD ["server"]
 
 COPY bin/ocis /usr/bin/ocis
+
+VOLUME [ "/var/tmp/ocis" ]

ocis/docker/Dockerfile.linux.arm64

@@ -15,3 +15,5 @@ ENTRYPOINT ["/usr/bin/ocis"]
 CMD ["server"]
 
 COPY bin/ocis /usr/bin/ocis
+
+VOLUME [ "/var/tmp/ocis" ]