build: disable go test -race for arm64

Race detection is not working properly in our arm64 runners.
It has been tested against both M1 and linux arm64 machines
and in both cases the results were aligned with the other
platforms.

By disabling this we can ensure race detection is being
enforced on the other platforms, and we can later review
this position.

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

.github/workflows/e2e.yaml

@@ -73,6 +73,14 @@ jobs:
         env:
           TEST_AZURE_ACCOUNT_NAME: ${{ secrets.TEST_AZURE_ACCOUNT_NAME }}
           TEST_AZURE_ACCOUNT_KEY: ${{ secrets.TEST_AZURE_ACCOUNT_KEY }}
+
+          # Temporarily disabling -race for arm64 as our GitHub action
+          # runners don't seem to like it. The race detection was tested
+          # on both Apple M1 and Linux arm64 with successful results.
+          #
+          # We should reenable go test -race for arm64 runners once the
+          # current issue is resolved.
+          GO_TEST_ARGS: ''
         run: make test
       - name: Prepare
         id: prep