Set up temporary Fly deployments for PRs

.github/workflows/pr-preview.yml

@@ -0,0 +1,165 @@
+name: 🔍 PR Preview Deploy
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, closed]
+
+env:
+  FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
+
+jobs:
+  deploy-pr:
+    name: 🚀 Deploy PR Preview
+    runs-on: ubuntu-latest
+    if: github.event.action != 'closed'
+
+    steps:
+      - name: ⬇️ Checkout repo
+        uses: actions/checkout@v4
+
+      - name: 🎈 Setup Fly
+        uses: superfly/flyctl-actions/[email protected]
+
+      - name: 🏷️ Generate app name
+        id: app-name
+        run: |
+          # Create a unique app name for this PR
+          APP_NAME="kcd-pr-${{ github.event.number }}"
+          echo "app_name=$APP_NAME" >> $GITHUB_OUTPUT
+          echo "url=https://$APP_NAME.fly.dev" >> $GITHUB_OUTPUT
+
+      - name: 📝 Setup PR-specific configurations
+        run: |
+          # Copy and modify fly.toml for PR preview
+          cp fly.toml fly.toml.backup
+
+          # Update app name for PR
+          sed -i 's/^app = .*/app = "${{ steps.app-name.outputs.app_name }}"/' fly.toml
+
+          # Remove consul from experimental section (if present)
+          sed -i '/enable_consul = true/d' fly.toml
+
+          # Add auto-scaling configuration to services section
+          # Find the [[services]] section and add auto-scaling after internal_port
+          awk '
+          /^\[\[services\]\]/ { in_services = 1 }
+          /^  internal_port = / && in_services { 
+            print $0
+            print "  auto_stop_machines = true"
+            print "  auto_start_machines = true" 
+            print "  min_machines_running = 0"
+            print "  processes = [\"app\"]"
+            in_services = 0
+            next
+          }
+          { print }
+          ' fly.toml > fly.toml.tmp && mv fly.toml.tmp fly.toml
+
+          # Copy and modify litefs.yml for PR preview (standalone, no consul)
+          cp other/litefs.yml other/litefs.yml.backup
+
+          # Replace consul lease with static lease for PR preview isolation
+          # This makes each PR preview a standalone instance
+          sed -i '/^lease:/,/^exec:/c\
+lease:\
+  type: static\
+\
+exec:' other/litefs.yml
+
+          # Add a comment explaining the isolation
+          sed -i '/^lease:/i\
+# PR Preview: Using static lease type for standalone instance\
+# This prevents syncing with production data' other/litefs.yml
+
+          echo "=== Modified fly.toml ==="
+          cat fly.toml
+          echo "=== Modified litefs.yml ==="
+          cat other/litefs.yml
+
+      - name: 🏗️ Create PR app
+        run: |
+          flyctl apps create ${{ steps.app-name.outputs.app_name }} --org personal || echo "App already exists"
+
+      - name: 🚀 Deploy PR app
+        run: |
+          flyctl deploy --depot --remote-only --build-arg COMMIT_SHA=${{ github.sha }} --app ${{ steps.app-name.outputs.app_name }}
+
+      - name: 💬 Comment on PR
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+
+            const botComment = comments.find(comment => 
+              comment.user.type === 'Bot' && comment.body.includes('PR Preview')
+            );
+
+            const commentBody = `🚀 **PR Preview Deployed**
+
+            Your pull request has been deployed to a temporary Fly machine:
+
+            🔗 **Preview URL**: ${{ steps.app-name.outputs.url }}
+            📱 **App Name**: \`${{ steps.app-name.outputs.app_name }}\`
+
+            This preview will automatically scale to zero when not in use to save costs.
+            The app will be automatically deleted when this PR is closed or merged.
+
+            ---
+            <sub>Updated: ${new Date().toISOString()}</sub>`;
+
+            if (botComment) {
+              github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: botComment.id,
+                body: commentBody
+              });
+            } else {
+              github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body: commentBody
+              });
+            }
+
+  cleanup-pr:
+    name: 🧹 Cleanup PR Preview
+    runs-on: ubuntu-latest
+    if: github.event.action == 'closed'
+
+    steps:
+      - name: 🎈 Setup Fly
+        uses: superfly/flyctl-actions/[email protected]
+
+      - name: 🏷️ Generate app name
+        id: app-name
+        run: |
+          APP_NAME="kcd-pr-${{ github.event.number }}"
+          echo "app_name=$APP_NAME" >> $GITHUB_OUTPUT
+
+      - name: 🗑️ Delete PR app
+        run: |
+          flyctl apps destroy ${{ steps.app-name.outputs.app_name }} --yes || echo "App doesn't exist or already deleted"
+
+      - name: 💬 Comment on PR
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const commentBody = `🧹 **PR Preview Cleaned Up**
+
+            The temporary Fly machine for this PR has been deleted.
+
+            ---
+            <sub>Cleaned up: ${new Date().toISOString()}</sub>`;
+
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: commentBody
+            });