fix: Build k6 images only on supported platforms (#206)

Signed-off-by: Jorge Turrado <jorge_turrado@hotmail.es>

Author: JorTurFer

.github/workflows/keda-k6-runner.yaml

@@ -35,3 +35,5 @@ jobs:
 
       - name: Build and publish Tools image
         run: make push-keda-k6-runner
+        env:
+          BUILD_PLATFORMS: linux/amd64,linux/arm64