Add workflow to backup module assets

.github/workflows/upload-assets.yml

@@ -0,0 +1,23 @@
+name: Upload assets
+on:
+  workflow_dispatch:
+
+jobs:
+  upload:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Save GPG Private Key
+        run: echo "${{ secrets.GPG_PRIVATE_KEY }}" > gpg_private_key.txt
+      - name: Save Passphrase
+        run: echo "${{ secrets.PASSPHRASE }}" > passphrase.txt
+      - name: Upload to S3
+        uses: jakejarvis/s3-sync-action@master
+        with:
+          args: --acl private --exclude '.git/*'
+          src: ./
+          dest: s3://port-tf-provider-assets/
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}