Add workflow to download Nimbus early experiments

.github/workflows/update-nimbus-experiments.yml

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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/
+
+name: "Update Nimbus Experiments"
+
+on:
+  schedule:
+    - cron: '*/30 * * * *'
+  workflow_dispatch: {}
+
+jobs:
+  update-nimbus-experiments:
+    name: "Update Nimbus Experiments"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout Main Branch"
+        uses: actions/checkout@v2
+        with:
+          path: fenix
+          ref: main
+      - name: "Update Experiments JSON"
+        id: update-experiments-json
+        uses: mozilla-mobile/update-initial-experiments@v1
+        with:
+          repo-path: fenix
+          output-path: app/src/main/res/raw/initial_experiments.json
+          experimenter-url: https://experimenter.services.mozilla.com/api/v6/experiments/?is_first_run=true
+          app-name: fenix
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          path: fenix
+          branch: automation/update-nimbus-experiments
+          commit-message: "update initial_experiments.json based on the current first-run experiments in experimenter"
+          title: "Update initial experiments JSON for Nimbus"
+          body: "This (automated) PR updates the initial_experiments.json on the `main` branch"
+          delete-branch: true