Add workflow to publish most recent release (#363)

## Changes

Workflow to publish most recent release to an S3 bucket (temporary).

## Tests

Need a workflow definition on main to test it.

.github/workflows/publish-latest.yml

@@ -0,0 +1,34 @@
+name: publish-latest
+
+on:
+  workflow_dispatch:
+
+  workflow_call:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          ref: release-s3
+
+      - name: Install s3cmd
+        run: |
+          sudo apt-get update
+          sudo apt-get install s3cmd
+
+      - name: Merge release branch
+        run: |
+          git config --global user.email "github-actions[bot]@users.noreply.github.com"
+          git config --global user.name "github-actions[bot]"
+          git merge origin/release-s3
+
+      - name: Publish to S3
+        working-directory: ./scripts
+        run: ./publish_to_s3.sh
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}