Test-case: check-audio-equalizer: Add shellcheck source line

This addition helps shellcheck to find the test cases library
and should avoid plenty of warnings printed.

Also the shellcheck and pylint runs-on are updated to Ubuntu
24.04 in Github workflow.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

.github/workflows/pull_request.yml

@@ -19,7 +19,7 @@ on: [pull_request, workflow_dispatch]
 jobs:
 
   shellcheck:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
         with:
@@ -32,7 +32,7 @@ jobs:
                text/x-shellscript shellcheck -x
 
   pylint:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       # :-( https://github.community/t/support-for-yaml-anchors/16128
       - uses: actions/checkout@v4

test-case/check-audio-equalizer.sh

@@ -18,6 +18,7 @@ set -e
 
 # source from the relative path of current folder
 my_dir=$(dirname "${BASH_SOURCE[0]}")
+# shellcheck source=case-lib/lib.sh
 source "$my_dir"/../case-lib/lib.sh
 
 OPT_NAME['t']='tplg'     OPT_DESC['t']="tplg file, default value is env TPLG: $TPLG"