Print warnings about changed file permissions in bulk

This will avoid mangled output when files have spaces within them.

action.yml

@@ -17,9 +17,8 @@ runs:
       shell: sh
       if: runner.os == 'Linux'
       run: |
-        for f in $(chmod -c -R +r . | awk '{print substr($3, 2, length($3)-2)}')
-        do
-          echo "::warning::Added read permission to $f"
+        chmod -c -R +r . | while read line; do
+          echo "::warning title=Changed permissions on a file::$line"
         done
         tar \
           --dereference --hard-dereference \
@@ -36,9 +35,8 @@ runs:
       shell: sh
       if: runner.os == 'macOS'
       run: |
-        for f in $(chmod -v -R +r .)
-        do
-          echo "::warning::Added read permission to $f"
+        chmod -v -R +r . | while read line; do
+          echo "::warning title=Changed permissions on a file::$line"
         done
         gtar \
           --dereference --hard-dereference \