Pre-commit fixes & exclude test/approvals from checks

Signed-off-by: Filip Gołaś <filip.golas@3mdeb.com>

.github/workflows/tests.yml

@@ -26,3 +26,4 @@ jobs:
           run: |
             cd dcu
             test/approve-ci
+            

.pre-commit-config.yaml

@@ -45,3 +45,5 @@ repos:
     -   id: shellcheck
         args: ["--severity=warning"]
         exclude: "^src/.*$"
+files: |
+  ^test/approvals/

test/approvals.bash

@@ -174,4 +174,4 @@ if diff --help | grep -- --color >/dev/null 2>&1; then
   diff_cmd="diff --unified --strip-trailing-cr -wB --color=always"
 else
   diff_cmd="diff --unified --strip-trailing-cr -wB"
-fi
+fi