new: dev: small refactor of ``file_get_hash`` !minor

bin/compose-core

@@ -2241,12 +2241,18 @@ clean_unused_docker_compose() {
 export -f clean_unused_docker_compose
 
 
-file_get_hash() {
-    local file="$1" sha
-    sha=$(sha256sum "$file")
+stdin_get_hash() {
+    local sha
+    sha=$(sha256sum) || return 1
     sha=${sha:0:64}
     echo "$sha"
 }
+export -f stdin_get_hash
+
+
+file_get_hash() {
+    stdin_get_hash < "$1" || return 1
+}
 export -f file_get_hash