add global release changelog (#277)

This will create a draft release with all of the changes since the last tag. We can use it for the "marketing" changes / changelog, where each package can then still get its own changelog file. The bulk of the configuration sits in the tauri-pps/.github repo.

.github/workflows/push-to-dev.yml

@@ -0,0 +1,14 @@
+name: dev push
+
+on:
+  push:
+    branches:
+      - dev
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v5.3.1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}