Install GNU tools

- GNU versions of sed and grep (compatible with the scripts)
- fix warning: GREP_COLOR='01;31' is deprecated; use GREP_COLORS='mt=01;31'

Author: artamonovkirill

Dockerfile

@@ -14,7 +14,7 @@ FROM maven:3.9.9-eclipse-temurin-21-alpine
 WORKDIR /opt/test-runner
 
 RUN apk update && \
-        apk add --no-cache jq && \
+        apk add --no-cache --upgrade jq sed grep && \
         rm -rf /var/cache/apk/*
 
 # Copy resources

bin/run.sh

@@ -103,7 +103,7 @@ else
 
     # Manually add colors to the output to help scanning the output for errors
     colorized_test_output=$(echo "${sanitized_output}" | \
-        GREP_COLOR='01;31' grep --color=always -E -e '^\[ERROR\].+$|$')
+        GREP_COLORS='mt=01;31' grep --color=always -E -e '^\[ERROR\].+$|$')
 
     jq -n --arg output "${colorized_test_output}" '{version: 1, status: "fail", message: $output}' > ${results_file}
 fi