Add fend for EOL newline linting to CI

Author: david-christiansen

.fend.yaml

@@ -0,0 +1,16 @@
+skip:
+  file:
+    - message-index/CNAME
+    - message-index/css/highlight.css
+    - message-index/js/highlight.min.js
+    - message-index/js/tablefilter.js
+
+  extension:
+    - .hi
+    - .o
+    - .png
+
+  dir:
+    - message-index/dist-newstyle
+    - message-index/_cache
+    - message-index/_site

.github/workflows/fend.yaml

@@ -0,0 +1,11 @@
+name: fend
+
+on: [push]
+
+jobs:
+  fend:
+    name: Fend
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: njgibbon/fend@main