sort | uniq appears to cause issues

Dockerfile

@@ -1,7 +1,7 @@
 FROM python:3-slim
 
 RUN apt update && apt -y upgrade
-RUN apt install -y curl jq sort uniq
+RUN apt install -y curl jq
 
 RUN pip install black
 

run_black_on_git_diff_adds.sh

@@ -18,7 +18,7 @@ echo "looking for diff at ${github_pr_url}"
 curl --request GET --url ${github_pr_url} --header "authorization: Bearer ${GITHUB_TOKEN}" --header "Accept: application/vnd.github.v3.diff" > github_diff.txt
 diff_length=`wc -l github_diff.txt`
 echo "approximate diff size: ${diff_length}"
-python_files=`cat github_diff.txt | grep -E -- "\+\+\+ |\-\-\- " | awk '{print $2}' | grep -Po -- "(?<=[ab]/).+\.py$ | sort | uniq"`
+python_files=`cat github_diff.txt | grep -E -- "\+\+\+ |\-\-\- " | awk '{print $2}' | grep -Po -- "(?<=[ab]/).+\.py$"`
 echo "python files edited in this PR: ${python_files}"
 
 if [[ -z "${LINE_LENGTH}" ]]; then