tweak GitHub workflow

Author: duncanpo

.github/workflows/test_linux_build.yml

@@ -25,6 +25,14 @@ jobs:
               run: |
                   cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DWITH_OTLP_GRPC=OFF -DWITH_OTLP_FILE=OFF -DCMAKE_INSTALL_PREFIX=${{ env.OPENTELEMETRY_MATLAB_INSTALL }}
                   cmake --build build --config Release --target install
+            - name: Run tests
+              env:
+                 # Add the installation directory to the MATLAB Search Path by
+                 # setting the MATLABPATH environment variable.
+                 MATLABPATH: ${{ env.OPENTELEMETRY_MATLAB_INSTALL }}
+              uses: matlab-actions/run-tests@v2
+              with:
+                 select-by-folder: opentelemetry-matlab/test
             - name: Compress into single artifact
               working-directory: ${{ github.workspace }}
               run: tar -czf otel-matlab-ubuntu.tar.gz otel_matlab_install