Make sure that all text files end with a newline character. (lra#1836)

* Make sure that all text files end with a newline character.

* Ignore legit files without newlines

* enable all rules

* Update .linelint.yml

.github/workflows/linelint.yaml

@@ -0,0 +1,16 @@
+# Make sure that all text files end with a newline character.
+# Configure your editor to end every file with a newline character.
+# See <https://stackoverflow.com/a/729795>
+on:
+  - pull_request
+  - push
+name: linelint
+jobs:
+  linelint:
+    runs-on: ubuntu-latest
+    name: Check if all files end with a newline character
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - 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:
+  - tests/fixtures/Library/Application Support/Box/Box Sync/sync_root_folder.txt
+  - tests/fixtures/Library/Mobile Documents/com~apple~CloudDocs/_blank_.md
+
+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