Add unit test stage

Dockerfile

@@ -40,3 +40,17 @@ USER blinky
 
 WORKDIR /home/blinky/
 
+FROM base AS unittest
+
+# Build unit tests
+RUN mkdir /tmp/arbitration_graphs/build && \
+    cd /tmp/arbitration_graphs/build && \
+    cmake -DBUILD_TESTS=true .. && \
+    cmake --build .
+
+# Run unit tests
+# Return with non-zero exit code if a test fails
+# See https://unix.stackexchange.com/a/392973 for reference
+CMD find /tmp/arbitration_graphs/build -type f -executable -name '*-gtest-*' -exec \
+    sh -c 'for test; do echo "Running test: $test"; $test || exit 1; done' _ {} +
+