speed up the workflow to not build just download

Author: duncanpo

.github/workflows/github_test.yml

@@ -1,20 +1,21 @@
-# Build OpenTelemetry-Matlab on Linux and run the GitHub example, with the workflow
-# itself instrumented to emit OpenTelemetry spans. The MATLAB example picks up the
-# TRACEPARENT environment variable set by the instrumentation so that the MATLAB spans
+# Install a released OpenTelemetry-Matlab toolbox on Linux and run the GitHub example, with
+# the workflow itself instrumented to emit OpenTelemetry spans. The MATLAB example picks up
+# the TRACEPARENT environment variable set by the instrumentation so that the MATLAB spans
 # and the GitHub workflow spans form a single trace.
 name: "GitHub Workflow Tracing Test"
 on:
     workflow_dispatch:
     push:
-      branches: 
+      branches:
         - github_otel
 env:
   MLM_LICENSE_TOKEN: ${{ secrets.MLM_LICENSE_TOKEN }}
 jobs:
-    build-and-run-github-example-ubuntu:
+    run-github-example-ubuntu:
         runs-on: ubuntu-22.04
         env:
-            OPENTELEMETRY_MATLAB_INSTALL: "${{ github.workspace }}/otel_matlab_install"
+            OTEL_MATLAB_RELEASE: "1.11.0"
+            OTEL_MATLAB_MLTBX: "${{ github.workspace }}/otel-matlab.mltbx"
         steps:
             # must be the first step so that all subsequent steps are captured as spans
             - name: Instrument job
@@ -25,34 +26,33 @@ jobs:
                 OTEL_EXPORTER_OTLP_PROTOCOL: "http/protobuf"
               with:
                 cache: 'false'
+            # source is only needed for the example
             - name: Download OpenTelemetry-Matlab source
               uses: actions/checkout@v3
               with:
                 path: opentelemetry-matlab
-            - name: Install ninja-build
-              run: sudo apt-get install ninja-build
+            - name: Download OpenTelemetry-Matlab release
+              env:
+                GH_TOKEN: ${{ github.token }}
+              run: gh release download "${{ env.OTEL_MATLAB_RELEASE }}" --repo "${{ github.repository }}" --pattern otel-matlab.mltbx --output "${{ env.OTEL_MATLAB_MLTBX }}"
             - name: Install MATLAB
               uses: matlab-actions/setup-matlab@v2
               with:
                 release: R2025a
-            - name: Build OpenTelemetry-Matlab
-              working-directory: opentelemetry-matlab
-              run: |
-                  cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${{ env.OPENTELEMETRY_MATLAB_INSTALL }}
-                  cmake --build build --config Release --target install
             # Run MATLAB in a shell step (rather than via matlab-actions/run-command) so that
             # it inherits the TRACEPARENT environment variable injected by the instrumentation.
             # The OTLP HTTP exporter in MATLAB reads the endpoint and headers from the
             # OTEL_EXPORTER_OTLP_* environment variables.
             - name: Run GitHub example
               env:
-                 # Add the installation directory to the MATLAB Search Path by
+                 # Add the example directory to the MATLAB Search Path by
                  # setting the MATLABPATH environment variable.
-                 MATLABPATH: "${{ env.OPENTELEMETRY_MATLAB_INSTALL }}:${{ github.workspace }}/opentelemetry-matlab/examples/github"
+                 MATLABPATH: "${{ github.workspace }}/opentelemetry-matlab/examples/github"
                  OTEL_EXPORTER_OTLP_ENDPOINT: ${{ secrets.OTEL_EXPORTER_OTLP_ENDPOINT }}
                  OTEL_EXPORTER_OTLP_HEADERS: ${{ secrets.OTEL_EXPORTER_OTLP_HEADERS }}
                  OTEL_EXPORTER_OTLP_PROTOCOL: "http/protobuf"
               run: |
                   echo "TRACEPARENT=$TRACEPARENT"
-                  # shut down the tracer provider at the end to flush all spans before MATLAB exits
-                  matlab-batch "github_example; opentelemetry.sdk.common.Cleanup.shutdown(opentelemetry.trace.Provider.getTracerProvider());"
+                  # install the toolbox, run the example, then shut down the tracer provider
+                  # to flush all spans before MATLAB exits
+                  matlab-batch "matlab.addons.install('${{ env.OTEL_MATLAB_MLTBX }}', true); github_example; opentelemetry.sdk.common.Cleanup.shutdown(opentelemetry.trace.Provider.getTracerProvider());"