[repo] Add .NET 8 target for W3C Trace Context Integration Test in CI (…

…#5800)

Co-authored-by: Piotr Kiełkowicz <[email protected]>

.github/workflows/ci.yml

@@ -129,7 +129,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ net6.0 ]
+        version: [ net6.0, net8.0 ]
     steps:
       - uses: actions/checkout@v4
       - name: Run W3C Trace Context docker compose

test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/Dockerfile

@@ -26,7 +26,9 @@ COPY --from=w3c /w3c .
 RUN apt-get update \
   && apt-get install -y python3-pip python3-dev \
   && cd /usr/local/bin \
-  && ln -s /usr/bin/python3 python \
-  && pip3 install --upgrade pip \
-  && pip3 install aiohttp
+  && ln -s /usr/bin/python3 python
+
+# net6.0 image uses Python 3.9, which doesn't have `--break-system-packages` option.
+RUN pip3 install --upgrade pip --break-system-packages || pip3 install --upgrade pip
+RUN pip3 install aiohttp --break-system-packages
 ENTRYPOINT ["dotnet", "vstest", "OpenTelemetry.Instrumentation.W3cTraceContext.Tests.dll", "--logger:console;verbosity=detailed"]

test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/W3CTraceContextTests.cs

@@ -69,7 +69,7 @@ public void W3CTraceContextTestSuiteAsync(string value)
             return result;
         });
 
-        app.RunAsync();
+        app.RunAsync("http://localhost:5000/");
 
         string result = RunCommand("python", "trace-context/test/test.py http://localhost:5000/");