CI: add remove SSH keys step

Author: ThibsG

.github/workflows/build_and_test_cosmian_vm.yml

@@ -62,6 +62,15 @@ jobs:
         with:
           credentials_json: ${{ secrets.GOOGLE_COSMIAN_DEV_CREDENTIALS }}
 
+      - name: Clean SSH keys
+        if: success() || failure()
+        run: |-
+          # https://github.com/kyma-project/test-infra/issues/93#issuecomment-457263589
+          for i in $(gcloud compute os-login ssh-keys list | grep -v FINGERPRINT); do \
+              echo "Removing ssh key: $i"; \
+              gcloud compute os-login ssh-keys remove --key $i || true; \
+          done
+    
       - name: Build GCP images - main
         env:
           TIMESTAMP: ${{ steps.env.outputs.TIMESTAMP }}