Automated publish (#1)

* Add release script

* Payload

.github/workflows/publish.yml

@@ -0,0 +1,29 @@
+name: Publish SplineRuntime.xcframework
+
+on:
+  repository_dispatch:
+    types: [runtime_publish]
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Dump GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "$GITHUB_CONTEXT"
+
+      - name: Download built SplineRuntime.xcframework
+        uses: actions/download-artifact@v4
+        with:
+          github-token: ${{ secrets.PATSPL }}
+          name: SplineRuntime_${{ github.event.client_payload.version }}
+          repository: ${{ github.event.client_payload.source_repo }}
+          run-id: ${{ github.event.client_payload.run_id }}
+
+      - name: Display downloaded files
+        run: ls -la