Fix actionlint config path resolution after cd into REPO_ROOT

After `cd "$REPO_ROOT"`, the config file checks still referenced
`$REPO_ROOT/.github/actionlint.yml`, creating a double-nested path
(e.g., FuzzyBot/FuzzyBot/.github/actionlint.yml) that never exists.
This caused the script to always fall back to the GitHub-Actions
default config, silently ignoring repo-local actionlint configs.

Use paths relative to cwd (which is already inside the repo after
the cd) instead of prefixing with $REPO_ROOT.

Co-authored-by: Justin Persaud <justinpersaud@users.noreply.github.com>

Author: MelvinBot

scripts/actionlint.sh

@@ -121,15 +121,16 @@ echo
 cd "$REPO_ROOT" || exit 1
 
 # If a repo has it's own action lint config, use that. Otherwise, use the one in this repo.
+# Note: we've already cd'd into $REPO_ROOT above, so use paths relative to cwd.
 CONFIG=""
-if [[ ! -f "$REPO_ROOT/.github/actionlint.yml" ]] && [[ ! -f "$REPO_ROOT/.github/actionlint.yaml" ]]; then
+if [[ ! -f ".github/actionlint.yml" ]] && [[ ! -f ".github/actionlint.yaml" ]]; then
     CONFIG=" -config-file $(readlink -f "$SCRIPT_DIR"/../.github/actionlint.yml)"
     info "Using default Github-Actions repo actionlint.yml" >&2
-else 
-    if [[ -f "$REPO_ROOT/.github/actionlint.yml" ]]; then
-        CONFIG=" -config-file $(readlink -f "$REPO_ROOT/.github/actionlint.yml")"
-    elif [[ -f "$REPO_ROOT/.github/actionlint.yaml" ]]; then
-        CONFIG=" -config-file $(readlink -f "$REPO_ROOT/.github/actionlint.yaml")"
+else
+    if [[ -f ".github/actionlint.yml" ]]; then
+        CONFIG=" -config-file $(readlink -f ".github/actionlint.yml")"
+    elif [[ -f ".github/actionlint.yaml" ]]; then
+        CONFIG=" -config-file $(readlink -f ".github/actionlint.yaml")"
     else
         error "Should be unreachable -- previously found a valid local actionlint but cannot find it now..."
         exit 1