Added missing workflows (#94)

* Added Cross-merge workflow

* Added PR assigner workflow

Author: ibexa-yuna

.github/workflows/cross-merge.yaml

@@ -0,0 +1,12 @@
+name: Ibexa Reusable / Cross Org PR
+
+on:
+  push:
+    branches-ignore:
+      - "temp_*"
+
+jobs:
+  call:
+    uses: ibexa/gh-workflows/.github/workflows/cross-merge.yml@main
+    secrets:
+      robot-token: ${{ secrets.EZROBOT_PAT }}

.github/workflows/pr-assign.yaml

@@ -0,0 +1,10 @@
+name: Assign Pull Request to maintainers
+
+on:
+    pull_request_target:
+
+jobs:
+    assign:
+        uses: ibexa/gh-workflows/.github/workflows/pr-assign.yml@main
+        secrets:
+            robot-token: ${{ secrets.EZROBOT_PAT }}