github: workflow: Check for EOF newline

The C standard requires that "A source file that is not empty shall
end with a newline character, which shall not be immediately preceded
by a backslash character before any such splicing takes place."

This workflow ensures compliance with this requirement.

Signed-off-by: Yasushi SHOJI <[email protected]>

Author: yashi

.github/workflows/linelint.yaml

@@ -0,0 +1,15 @@
+name: EOF newline
+
+on:
+  pull_request
+
+jobs:
+  linelint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Linelint
+        uses: fernandrone/linelint@master

.linelint.yml

@@ -0,0 +1,19 @@
+# 'true' will fix files
+autofix: false
+
+# list of paths to ignore, uses gitignore syntaxes (executes before any rule)
+ignore:
+  - /.git
+  - /zephyr
+
+rules:
+  # checks if file ends in a newline character
+  end-of-file:
+    # set to true to enable this rule
+    enable: true
+
+    # set to true to disable autofix (if enabled globally)
+    disable-autofix: true
+
+    # if true also checks if file ends in a single newline character
+    single-new-line: true