fix: handle error from pipes (#289)

entrypoint.sh

@@ -1,21 +1,21 @@
 #!/usr/bin/env bash
 
-set -e
-
-echo "::group::verify-changed-files"
+set -euo pipefail
 
 INPUT_SEPARATOR="${INPUT_SEPARATOR//\%/%25}"
 INPUT_SEPARATOR="${INPUT_SEPARATOR//\./%2E}"
 INPUT_SEPARATOR="${INPUT_SEPARATOR//\\n/%0A}"
 INPUT_SEPARATOR="${INPUT_SEPARATOR//\\r/%0D}"
 
+echo "::group::verify-changed-files"
+
 echo "Separator: $INPUT_SEPARATOR"
 
 if [[ -n "$INPUT_FILES_PATTERN_FILE" ]]; then
-  TRACKED_FILES=$(git diff --diff-filter=ACMUXTRD --name-only | grep -x -E -f "$INPUT_FILES_PATTERN_FILE" | awk -v d="|" '{s=(NR==1?s:s d)$0}END{print s}')
+  TRACKED_FILES=$(git diff --diff-filter=ACMUXTRD --name-only | { grep -x -E -f "$INPUT_FILES_PATTERN_FILE" || true; } | awk -v d="|" '{s=(NR==1?s:s d)$0}END{print s}')
 
   # Find untracked changes
-  UNTRACKED_FILES=$(git ls-files --others --exclude-standard | grep -x -E -f "$INPUT_FILES_PATTERN_FILE" | awk -v d="|" '{s=(NR==1?s:s d)$0}END{print s}')
+  UNTRACKED_FILES=$(git ls-files --others --exclude-standard | { grep -x -E -f "$INPUT_FILES_PATTERN_FILE" || true; } | awk -v d="|" '{s=(NR==1?s:s d)$0}END{print s}')
 else
   TRACKED_FILES=$(git diff --diff-filter=ACMUXTRD --name-only | awk -v d="|" '{s=(NR==1?s:s d)$0}END{print s}')