Remove nightly workflow

Signed-off-by: Ming Li <mli103hawk@gmail.com>

.github/workflows/e2e-arm64-nightly.yaml

@@ -1,21 +0,0 @@
----
-name: E2E Arm64 Nightly
-permissions: read-all
-on:
-  # schedules always run against the main branch, hence we have to create separate jobs
-  # with individual checkout actions for each of the active release branches
-  schedule:
-    - cron: '30 1 * * *' # runs daily at 1:30 am.
-
-  # workflow_dispatch enables manual testing of this job by maintainers
-  workflow_dispatch:
-
-jobs:
-  main-arm64:
-    uses: ./.github/workflows/e2e-arm64-template.yaml
-    with:
-      etcdBranch: main
-  release-35-arm64:
-    uses: ./.github/workflows/e2e-arm64-template.yaml
-    with:
-      etcdBranch: release-3.5

.github/workflows/e2e-arm64-template.yaml

@@ -1,44 +0,0 @@
----
-name: Reusable Arm64 E2E Workflow
-on:
-  workflow_call:
-    inputs:
-      etcdBranch:
-        required: true
-        type: string
-permissions: read-all
-jobs:
-  test:
-    # this is to prevent the job to run at forked projects
-    if: github.repository == 'etcd-io/etcd'
-    runs-on: actuated-arm64-8cpu-32gb
-    strategy:
-      fail-fast: false
-      matrix:
-        target:
-          - linux-arm64-e2e
-    steps:
-      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-        with:
-          ref: "${{ inputs.etcdBranch }}"
-      - id: goversion
-        run: echo "goversion=$(cat .go-version)" >> "$GITHUB_OUTPUT"
-      - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
-        with:
-          go-version: ${{ steps.goversion.outputs.goversion }}
-      - env:
-          TARGET: ${{ matrix.target }}
-        run: |
-          set -euo pipefail
-          go clean -testcache
-
-          echo "${TARGET}"
-          case "${TARGET}" in
-            linux-arm64-e2e)
-              GOOS=linux GOARCH=arm64 CPU=4 EXPECT_DEBUG=true make test-e2e-release
-              ;;
-            *)
-              echo "Failed to find target"
-              exit 1
-              ;;
-          esac