Lint trailing whitespace (#3230)

.github/ISSUE_TEMPLATE/config.yml

@@ -9,4 +9,3 @@ contact_links:
   - name: Frequently Asked Question
     url: https://esphome.io/guides/faq.html
     about: Please view the FAQ for common questions and what to include in a bug report.
-    

script/ci-custom.py

@@ -591,6 +591,11 @@ def lint_inclusive_language(fname, match):
     )
 
 
+@lint_re_check(r"[\t\r\f\v ]+$")
+def lint_trailing_whitespace(fname, match):
+    return "Trailing whitespace detected"
+
+
 @lint_content_find_check(
     "ESP_LOG",
     include=["*.h", "*.tcc"],

tests/component_tests/button/test_button.yaml

@@ -18,4 +18,3 @@ button:
     name: wol_test_2
     id: wol_2
     internal: false
-