fix: allow non-Compose commits on Docker-free hosts [skip ci]

actions/utils/lint-docker-compose.py

@@ -12,8 +12,6 @@ def run(ctx, args):
     log, s = ctx.log, ctx.sys
     repo = ctx.paths.repo_root
     rc_ip = _validate_anchor_ips(ctx)
-    if not shutil.which("docker"):
-        log.error("docker is not installed or not in PATH."); return rc_ip or 1
 
     files_string, targets = "", ["."]
     if args.hook:
@@ -25,6 +23,9 @@ def run(ctx, args):
             log.info("No staged docker-compose files to lint."); return rc_ip
         targets = [f"/workdir/{f}" for f in files_string.splitlines()]
 
+    if not shutil.which("docker"):
+        log.error("docker is not installed or not in PATH."); return rc_ip or 1
+
     log.info("Running dclint --fix (via docker)...")
     env_args = []
     for k in ("HTTP_PROXY", "HTTPS_PROXY", "http_proxy", "https_proxy", "NO_PROXY", "no_proxy"):