ALP-5359 install missing curl and xz

container/Dockerfile.ascn

@@ -27,7 +27,8 @@ RUN apt-get install -y \
 # ALP-5359 XXX this is kinda hackish:
 # We need a libsndfile fix, but still want the libsndfile package
 # for other dependencies, so we install the build over it
-RUN curl https://uplex.de/private/libsndfile-1.1.0.tar.xz | tar xvJf - && \
+RUN apt-get install -y xz-utils curl && \
+    curl https://uplex.de/private/libsndfile-1.1.0.tar.xz | tar xvJf - && \
     cd libsndfile-1.1.0 && \
     ./configure --prefix=/usr --libdir=/lib/x86_64-linux-gnu && \
     make && make install && \