Add reusable release workflows

Signed-off-by: Alexander Maslennikov <amaslennikov@nvidia.com>

.github/workflows/fork-ci.yml

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+name: Fork Release CI
+
+on:
+  push:
+    branches:
+      - network-operator-*
+    tags:
+      - network-operator-*
+
+jobs:
+  call-reusable-ci-fork-workflow:
+    uses: Mellanox/cloud-orchestration-reusable-workflows/.github/workflows/fork-ci-reusable.yml@main
+    with:
+      registry-internal: nvcr.io/nvstaging/mellanox
+      service-account-username: nvidia-cicd
+      service-account-email: svc-cloud-orch-gh@nvidia.com
+      components: '[{"name": "Multus", "imageName": "multus-cni", "Dockerfile": "images/Dockerfile"}]'
+    secrets:
+      registry-username: ${{ github.repository_owner }}
+      registry-token: ${{ secrets.GITHUB_TOKEN }}
+      cicd-gh-token: ${{ secrets.GH_TOKEN_NVIDIA_CI_CD }}

.github/workflows/fork-sync.yml

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+name: Fork Sync
+
+on:
+  schedule:
+    - cron: '0 0 * * *' # nightly
+  workflow_dispatch:    # enable manual trigger
+
+jobs:
+  call-reusable-sync-fork-workflow:
+    uses: Mellanox/cloud-orchestration-reusable-workflows/.github/workflows/fork-sync-reusable.yml@main
+    with:
+      upstream-owner: k8snetworkplumbingwg
+      default-branch: master
+    secrets:
+      gh_token: ${{ secrets.GITHUB_TOKEN }}