Fix kettu installation for Alpine image

Dockerfile.alpine

@@ -9,11 +9,12 @@ RUN echo "@testing http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/ap
     && apk --no-cache add bash dumb-init ip6tables ufw@testing openvpn shadow transmission-daemon \
     && echo "Install dockerize $DOCKERIZE_VERSION" \
     && wget -qO- https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz | tar xz -C /usr/bin \
-    && mkdir -p /opt/transmission-ui/combustion-release /opt/transmission-ui/kettu \
+    && mkdir -p /opt/transmission-ui \
     && echo "Install Combustion" \
     && wget -qO- https://github.com/Secretmapper/combustion/archive/release.tar.gz | tar xz -C /opt/transmission-ui \
     && echo "Install kettu" \
-    && wget -qO- https://github.com/endor/kettu/archive/master.tar.gz | tar xz -C /opt/transmission-ui/kettu \
+    && wget -qO- https://github.com/endor/kettu/archive/master.tar.gz | tar xz -C /opt/transmission-ui \
+    && mv /opt/transmission-ui/kettu-master /opt/transmission-ui/kettu \
     && rm -rf /tmp/* /var/tmp/* \
     && groupmod -g 1000 users \
     && useradd -u 911 -U -d /config -s /bin/false abc \