I have a gitlab-ci.yml which builds a project and should deploy it to a windows share, but the second stage where I mount a windows share does not work inside my runner.

I have a windows machine with Docker Desktop installed and started the runner.

Mounting the share when starting the container and mounting manually works fine like this

 docker run -it --cap-add=SYS_ADMIN --cap-add=DAC_READ_SEARCH --rm myimagefromnexus:latest

 apt-get update && apt-get install -y smbclient

 mkdir -p /mnt/windows_share

 mount -t cifs -o username=myuser,password=pwwithspecialchar\$\!,workgroup=mygrp,dir_mode=0777,file_mode=0666 //serverpany.at/sharename\$/Test /mnt/windows_share

whats special here is, that the sharename and password can contain a special character, but these are correctly escaped.

this is my config.toml for my runner

  [runners.docker]
   cap_add = ["SYS_ADMIN", "DAC_READ_SEARCH"]
   tls_verify = false
   image = "myimagefromnexus:latest"
   privileged = true / false neither works
   disable_entrypoint_overwrite = false
   oom_kill_disable = false
   disable_cache = false
   volumes = ["/cache"]
   shm_size = 0
   network_mtu = 0

and this is my gitlab-ci.yml

image: myimagefromnexus:latest

stages:
  - build
  - deploy

variables:
  BUILD_DIR: "bin/Release"
  PROJECT_FILE: "project.csproj"
  SHARE_PATH: "$SHARE_PATH_STAGE"
  MOUNT_DIR: "/mnt/windows_share"

before_script:
  - echo "Running before_script..."
  - apt-get update && apt-get install -y smbclient
  - echo "smbclient installed"

build:
  stage: build
script:  
  - dotnet build "$PROJECT_FILE" --configuration Release
  - |
    echo "Mounting $SHARE_PATH to $MOUNT_DIR with user $WINDOWS_USER..."
artifacts:
  paths:
    - $BUILD_DIR

deploy:
  stage: deploy
script:
  -  echo "Mounting $SHARE_PATH to $MOUNT_DIR with user $WINDOWS_SHARE_USER and copy 
   content of $BUILD_DIR..."  
  -  | 
  pwd   
  cat /proc/self/status | grep NoNewPrivs
  if [[ "$CI_COMMIT_BRANCH" == "main" ]]; then
    echo "Deploying to production..."
  else
    echo "Deploying to stage..."
  fi

  echo "Mounting $SHARE_PATH to $MOUNT_DIR with user $WINDOWS_SHARE_USER..." 
  if findmnt --target "$MOUNT_DIR" > /dev/null; then
    echo "Unmounting existing mount at $MOUNT_DIR"
    umount $MOUNT_DIR
  fi

  if [[ ! -d "$MOUNT_DIR" ]]; then
    mkdir -p "$MOUNT_DIR"
  else
    echo "$MOUNT_DIR already exists"
  fi

  if ! mount | grep -q "$SHARE_PATH"; then
    echo "Mounting $SHARE_PATH to $MOUNT_DIR with user $WINDOWS_SHARE_USER..."
    mount -t cifs -v -o username=$WINDOWS_SHARE_USER,password=$WINDOWS_SHARE_USER_PASSWORD,workgroup=mygrp,dir_mode=0777,file_mode=0666,vers=3.0 $SHARE_PATH $MOUNT_DIR
  else
    echo "$SHARE_PATH is already mounted."
  fi
  echo "Mount failed with exit code: $?"
  mount | grep cifs
  echo "Copying files from $BUILD_DIR to $MOUNT_DIR..."
  cp -r $BUILD_DIR/* $MOUNT_DIR/ || { echo "Failed to copy files"; exit 1; }
  echo "Files copied successfully to $MOUNT_DIR"
only:
  - branches
dependencies:
  - build

which results in the following error in my runner

mount error(13): Permission denied

Thank you for your help