Do not run arm64 jobs on forks

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

.github/workflows/e2e-arm64.yaml

@@ -5,6 +5,8 @@ on:
 permissions: read-all
 jobs:
   test:
+    # this is to prevent the job to run at forked projects
+    if: github.repository == 'etcd-io/etcd'
     runs-on: [Linux, ARM64]
     strategy:
       fail-fast: true

.github/workflows/tests-arm64.yaml

@@ -4,6 +4,8 @@ on:
     - cron: '30 1 * * *' # runs daily at 1:30 am.
 jobs:
   test:
+    # this is to prevent the job to run at forked projects
+    if: github.repository == 'etcd-io/etcd'
     runs-on: [Linux, ARM64]
     strategy:
       fail-fast: false