Fix build-tarball: use dir shared between GitLab runner and Docker

.gitlab-ci.yml

@@ -2,6 +2,9 @@ image: docker
 services:
   - docker:dind
 
+variables:
+  GITLAB_SHARED_DIND_DIR: /builds/$CI_PROJECT_PATH/shared
+
 stages:
   - build
 
@@ -11,6 +14,7 @@ build:
     - ls -l
     - pwd
     - apk add bash
+    - mkdir -p "$GITLAB_SHARED_DIND_DIR" && chmod 777 "$GITLAB_SHARED_DIND_DIR"
     - bash builder/build-tarball
     - bash builder/build-deb
     - mkdir output

builder/build-tarball

@@ -7,6 +7,8 @@ build_www_dir() {
   docker run --rm -v $PWD/builder/www:/build kasmweb/www:latest
 }
 
+shared_with_docker_dir=${GITLAB_SHARED_DIND_DIR:-/tmp}
+
 cd "$(dirname "$0")/.."
 
 build_www_dir
@@ -14,9 +16,9 @@ build_www_dir
 docker pull ubuntu:18.04
 docker build -t kasmvncbuilder:18.04 -f builder/dockerfile.ubuntu1804.build .
 mkdir -p builder/build
-docker run -v /tmp:/build --rm kasmvncbuilder:18.04
+docker run -v $shared_with_docker_dir:/build --rm kasmvncbuilder:18.04
 
 L_GID=$(id -g)
 L_UID=$(id -u)
-chown $L_UID:$L_GID /tmp/kasmvnc.ubuntu_18.04.tar.gz
-mv /tmp/kasmvnc.ubuntu_18.04.tar.gz $PWD/builder/build/
+chown $L_UID:$L_GID $shared_with_docker_dir/kasmvnc.ubuntu_18.04.tar.gz
+mv $shared_with_docker_dir/kasmvnc.ubuntu_18.04.tar.gz $PWD/builder/build/