workflows/format-patch: fix git format-patch (#27)

refer to https://www.ffmpeg.org/developer.html#Submitting-patches-1

add header "X-Unsent: 1"
add email recipients

Signed-off-by: Jack Lau <[email protected]>

Author: Jack Lau

.github/workflows/format-patch.sh

@@ -149,7 +149,7 @@ if [[ -z "$PATCH_FILE" ]]; then
   PATCH_FILE="whip-patch-$PR_NUMBER-$(date +%s).patch" 
 fi &&
 rm -f $PATCH_FILE &&
-git format-patch -1 --stdout > $PATCH_FILE &&
+git format-patch --add-header "X-Unsent: 1" --to [email protected] -1 --stdout > $PATCH_FILE &&
 echo "Created patch file: $PATCH_FILE"
 if [[ $? -ne 0 ]]; then
     echo "Failed to create patch file."