chore(22.04): fix pkg-deps job

This commit fixes the pkg-deps job with proper event and permissions.

.github/workflows/ci-pr-target.yaml

@@ -0,0 +1,14 @@
+# This workflow supports jobs which needs the on.pull_request_target event
+# instead of the usual on.pull_request event.
+name: CI
+run-name: CI for ${{ github.ref }}
+
+on:
+  pull_request_target:
+    branches:
+      - "ubuntu-*"
+
+jobs:
+  pkg-deps:
+    name: Package dependencies
+    uses: rebornplusplus/chisel-releases/.github/workflows/pkg-deps.yaml@main

.github/workflows/ci.yaml

@@ -19,8 +19,3 @@ jobs:
   lint:
     name: Lint
     uses: canonical/chisel-releases/.github/workflows/lint.yaml@main
-
-  pkg-deps:
-    if: github.event_name == 'pull_request'
-    name: Package dependencies
-    uses: canonical/chisel-releases/.github/workflows/pkg-deps.yaml@main