Merge rust-bitcoin#4605: Remove _all_ the trailing whitespace

6cb4e29 Remove _all_ the trailing whitespace (Tobin C. Harding)

Pull request description:

  Recently we tried to make the rustfmt bot remove trailing whitespace but wrote the `sed` command incorrectly - it only removes a single character.

  Tested by running the new command on rust-bitcoin#4600.

ACKs for top commit:
  jamillambert:
    ACK 6cb4e29
  apoelstra:
    ACK 6cb4e29; successfully ran local tests

Tree-SHA512: dd5c4ad3b38848ff5603e5b7077a9b3b62e6e3b232583ac62a486ba3ee71e27d3fe0d404c53110c484d44ca98dee9013be5ff232f4705e9c2ed6be04705395d0

Author: apoelstra

.github/workflows/cron-weekly-rustfmt.yml

@@ -14,7 +14,7 @@ jobs:
           components: rustfmt
       - name: Run Nightly rustfmt
         # Run the formatter and manually remove trailing whitespace.
-        run: cargo +nightly fmt && find . -type f -name '*.rs' -exec sed -i 's/ $//' {} \;
+        run: cargo +nightly fmt && git ls-files -- '*.rs' -z | xargs sed -E -i'' -e 's/[[:space:]]+$//'
       - name: Get the current date
         run: echo "date=$(date +'%Y-%m-%d')" >> $GITHUB_ENV
       - name: Create Pull Request