fix: strip trailing whitespaces from gitignore.io responses

gitignore.io sometimes returns files with trailing whitespaces at the end of lines.
This causes issues when editors remove the whitespaces on formatting,
causing autogenerated parts of .gitignore file to change and fail kraken check.

Author: tomkarw

.changelog/_unreleased.toml

@@ -0,0 +1,8 @@
+[[entries]]
+id = "bf3a15ca-a70d-442e-a8bc-2092c71ac08b"
+type = "fix"
+description = "strip trailing whitespaces from gitignore.io responses"
+author = "@tomkarw"
+issues = [
+    "https://github.com/tomkarw/kraken/issues/81",
+]

kraken-build/src/kraken/std/git/gitignore/gitignore_io.py

@@ -61,7 +61,12 @@ def gitignore_io_fetch(tokens: Sequence[str]) -> str:
     url = GITIGNORE_API_URL + ",".join(tokens)
     response = http.get(url)
     response.raise_for_status()
-    return response.text.replace("\r\n", "\n")
+    lines = response.text.replace("\r\n", "\n").split("\n")
+    # gitignore.io sometimes returns files with trailing whitespaces at the end of lines
+    # this causes issues when editors remove the whitespaces on formatting, causing autogenerated
+    # parts of .gitignore file to change and fail kraken check
+    lines = [line.rstrip() for line in lines]
+    return '\n'.join(lines)
 
 
 def gitignore_io_fetch_cached(tokens: Sequence[str], backfill: bool) -> str: