build-unit-test-docker: Add meson support

This adds meson and ninja to the packages installed in the environment.
This does not add support for unit testing meson based builds yet.

Change-Id: I190b12b5f6c3ea328ee49bc1c1c54cc87fe1ea3b
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index 859d36a..28f33d0 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -171,6 +171,7 @@
     libevdev2-dbgsym \
     libjpeg-dev \
     libpng-dev \
+    ninja-build \
     sudo \
     curl \
     git \
@@ -195,6 +196,7 @@
 
 RUN pip install inflection
 RUN pip install pycodestyle
+RUN pip3 install meson==0.49.0
 
 FROM openbmc-base as openbmc-googletest
 RUN curl -L https://github.com/google/googletest/archive/${PKG_REV['googletest']}.tar.gz | tar -xz && \