Try the explicit SHA1 signature env variable

Author: marcpopMSFT

eng/pipelines/templates/jobs/sdk-job-matrix.yml

@@ -40,9 +40,7 @@ parameters:
     helixTargetContainer: $(helixTargetContainerPrefix)ubuntu-22.04-helix-amd64
     osProperties: $(linuxOsPortableProperties)
     env:
-      COMPlus_EnableAlternateStackCheck: 0
-      DOTNET_SYSTEM_NET_HTTP_USESOCKETSHTTPHANDLER: 0
-      DOTNET_SYSTEM_GLOBALIZATION_INVARIANT: 1
+      OPENSSL_ENABLE_SHA1_SIGNATURES: 1
     # Skipping all container-based testing for now.
     # See: https://github.com/dotnet/sdk/issues/40935
     runTests: false