ci: add codeowners to gotestsum report (#3118)

Author: hannahkm

.github/actions/add-codeowners/codeowners.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+for file in "$@"; do
+    temp_file="tempfile.xml"
+
+    # force write a new line at the end of the gotestsum-report.xml, or else
+    # the loop will skip the last line.
+    # fixes issue with a missing </testsuites>
+    echo -e "\n" >> $file
+
+    while read p; do
+        # we might try to report gotestsum-report.xml multiple times, so don't
+        # calculate codeowners more times than we need
+        if [[ "$p" =~ \<testcase && ! "$p" =~ "file=" ]]; then
+            class=$(echo "$p" | grep -o '.v1/[^"]*"')
+            file_name=$(echo "${class:3}" | sed 's/.$//') # trim off the edges to get the path
+            new_line=$(echo "$p" | sed "s|<testcase \([^>]*\)>|<testcase \1 file=\"$file_name\">|")
+            echo "$new_line" >> "$temp_file"
+        else 
+            echo "$p" >> "$temp_file"
+        fi
+    done < $file
+
+    mv "$temp_file" $file
+done 

.github/actions/dd-ci-upload/action.yml

@@ -42,6 +42,10 @@ runs:
         curl -L --fail "https://github.com/DataDog/datadog-ci/releases/latest/download/datadog-ci_${{ env.DD_CI_CLI_BUILD }}" --output datadog-ci    
         chmod +x datadog-ci
 
+    - name: Add CodeOwners to JUnit files
+      shell: bash
+      run: cd ./.github/actions/add-codeowners && ./codeowners.sh ${{ inputs.files }}
+
     - name: Upload the JUnit files
       shell: bash
       run: |