add staging manual deploy step

.github/workflows/deploy-staging.yml

@@ -0,0 +1,38 @@
+name: Deploy to Staging
+
+on:
+  pull_request: # to remove before merge this is for the workflow to appear in the PR
+  workflow_dispatch:
+
+jobs:
+  deploy-staging:
+    name: Deploy to Staging
+    runs-on: ubuntu-20.04
+    timeout-minutes: 20
+    env:
+      DOCKER_BUILDKIT: 1
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Setup SSH
+        uses: webfactory/[email protected]
+        with:
+          ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          gemfile: .kamal/deployment.gemfile
+      - name: Deploy to Staging
+        env:
+          VERSION: ${{ github.sha }}
+          KAMAL_REGISTRY_PASSWORD: ${{ secrets.KAMAL_REGISTRY_PASSWORD }}
+          KAMAL_RAILS_MASTER_KEY: ${{ secrets.KAMAL_RAILS_MASTER_KEY }}
+          MEILI_MASTER_KEY: ${{ secrets.MEILI_MASTER_KEY }}
+        run: bundle exec kamal deploy -d staging
+      - name: Cleanup on cancellation
+        if: always() && steps.deploy.conclusion == 'cancelled'
+        run: bundle exec kamal lock release

.kamal/deployment.gemfile

@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'kamal'