Add cpan publish gh action

Author: geofffranks

.github/workflows/publish-cpan.yml

@@ -0,0 +1,18 @@
+name: Publish to CPAN
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  publish-ui:
+    name: Publish to CPAN
+    runs-on: ubuntu-latest
+    environment: Release
+    steps:
+      - uses: actions/checkout@v2
+      - uses: cucumber/[email protected]
+        with:
+          cpan-user: ${{ secrets.CPAN_USER }}
+          cpan-password: ${{ secrets.CPAN_PASSWORD }}
+          working-directory: "perl"