replacing Cirrus CI with github actions

Author: Karl-Johan Alm

.cirrus.yml

@@ -0,0 +1,11 @@
+name: GitHub Actions Check
+run-name: ${{ github.actor }} Checks 🚀
+on: [push, pull_request]
+jobs:
+  All-Checks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: scripts/link-format-chk.sh
+      - run: scripts/buildtable.pl >/tmp/table.mediawiki || exit 1
+      - run: scripts/diffcheck.sh