replace travis with Github Actions

Author: Karl-Johan Alm

.github/workflows/github-action-checks.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

.travis.yml

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+diff README.mediawiki /tmp/table.mediawiki | grep '^[<>] |' >/tmp/after.diff || true
+if git checkout HEAD^ && scripts/buildtable.pl >/tmp/table.mediawiki 2>/dev/null; then
+    diff README.mediawiki /tmp/table.mediawiki | grep '^[<>] |' >/tmp/before.diff || true
+    newdiff=$(diff -s /tmp/before.diff /tmp/after.diff -u | grep '^+')
+    if [ -n "$newdiff" ]; then
+        echo "$newdiff"
+        exit 1
+    fi
+else
+    echo 'Cannot build previous commit table for comparison'
+fi

scripts/diffcheck.sh

@@ -8,7 +8,8 @@
 
 ECODE=0
 FILES=""
-for fname in $(git diff --name-only HEAD $(git merge-base HEAD master)); do
+git fetch origin master
+for fname in $(git diff --name-only HEAD $(git merge-base HEAD origin/master)); do
     if [[ $fname == *.mediawiki ]]; then
         GRES=$(grep -n '](http' $fname)
         if [ "$GRES" != "" ]; then