👷 CI test without src filter (emulate Arduino) (#24335)

buildroot/bin/ci_src_filter

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+# exit on first failure
+set -e
+
+SED=$(which gsed sed | head -n1)
+FN="platformio.ini"
+
+if [[ $1 == "-n" ]]; then
+  "${SED}" -i "s/default_src_filter/org_src_filter/" $FN
+  "${SED}" -i "/org_src_filter/ s/^/default_src_filter = +<src\/*>\n/" $FN
+else
+  git checkout $FN 2>/dev/null
+fi