feat(ci): auto-generate latest SDK

Auto-generate latest SDK on updates to openapi.json file.

.github/workflows/generate.yaml

@@ -0,0 +1,32 @@
+name: Generate
+
+on:
+  workflow_dispatch: {}
+  pull_request:
+    paths:
+      - openapi.json
+    branches:
+      - main
+
+env:
+  GOPRIVATE: "github.com/sumup/*"
+
+jobs:
+  generate:
+    name: Generate
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
+        with:
+          go-version: '1.22'
+
+      - run: git config --global url."https://x-access-token:${{ secrets.GH_ACTIONS_PAT_2 }}@github.com/".insteadOf "https://github.com/"
+
+      - run: go install github.com/sumup/gogenitor@latest
+
+      # Would be nice to run this from gogenitor but goimports can't be imported as a pkg
+      - run: go install golang.org/x/tools/cmd/goimports@latest
+
+      - run: gogenitor --out . --specs ./openapi.json