Add daily e2e job for refreshing the cache

To refresh the cache we need to checkout ramen source and run drenv
cache with the environment files. Using a workflow for this make this
job easy to implement and manage without accessing the runner directly.

The job can also run manually from github UI. This is likely to work for
people with write access.

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

.github/workflows/e2e-daily.yaml

@@ -0,0 +1,36 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+# yamllint disable rule:line-length
+name: E2E Daily
+
+on:  # yamllint disable-line rule:truthy
+  # Run every day on 03:00.
+  schedule:
+    - cron: '0 3 * * *'
+  # Allow manual run.
+  # (Actions -> E2E Daily -> Run workflow)
+  workflow_dispatch:
+
+jobs:
+  refresh-cache:
+    runs-on: [self-hosted, e2e-rdr]
+    if: github.repository == 'RamenDR/ramen'
+
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v4
+
+      - name: Install drenv
+        run: pip install -e test
+
+      - name: Refresh cache
+        uses: nick-fields/retry@v3
+        with:
+          timeout_minutes: 2
+          retry_wait_seconds: 60
+          max_attempts: 10
+          command: |
+            cd test
+            drenv cache -v envs/regional-dr.yaml