Update workflow so working directory has access to performance files

Author: MWSestabro

.github/workflows/performance_benchmark.yml

@@ -50,13 +50,14 @@ jobs:
                   cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DWITH_EXAMPLES=ON -DUSE_BATCH_FOR_MCC=ON -DOTEL_MATLAB_VERSION=${{ needs.get_version.outputs.version }} -DCMAKE_INSTALL_PREFIX=${{ env.OPENTELEMETRY_MATLAB_INSTALL }}
                   cmake --build build --config Release --target install
             - name: Run Benchmark
+              working-directory: opentelemetry-matlab
               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-command@v2
               with:
-                 command: addpath("test/performance"), runPerf
+                 command: addpath("./test/performance"), runPerf
             - name: Download previous benchmark data
               uses: actions/cache@v4
               with: