Run docker image as appropriate user

Author: rimi-itk

.github/workflows/documentation.yaml

@@ -1,5 +1,10 @@
 on: pull_request
+
 name: Review
+
+env:
+  COMPOSE_USER: root
+
 jobs:
   check-github-actions-documentation:
     runs-on: ubuntu-latest

Taskfile.yml

@@ -52,7 +52,7 @@ tasks:
           if [[ $(head --lines=1 "$f") =~ "^# " ]]; then
             # … replace the header.
             # This is done by deleting all lines from the top of the file to a blank line.
-            docker run --rm --volume=$PWD:/app itkdev/php8.3-fpm:latest sed -i '1,/^$/d' "$f"
+            docker run --rm --volume=$PWD:/app --user ${COMPOSE_USER:-deploy} itkdev/php8.3-fpm:latest sed -i '1,/^$/d' "$f"
           fi
 
           # Write header and file into temporary file.