Running with gitlab-runner 17.5.1 (affd9e7d)
  on gitlab-runner-02 Fo1GHkM6a, system ID: s_e11362da0243
section_start:1729600900:prepare_executor
Preparing the "docker" executor
Using Docker executor with image gliderlabs/herokuish:latest ...
Starting service postgres:9.6.16...
Pulling docker image postgres:9.6.16 ...
Using docker image sha256:cb2889ab0680ba518e0dc1bb5a09cbe23f1e5908d9e484daea3d34f5e092ec17 for postgres:9.6.16 with digest postgres@sha256:d6a6badb2b5b22de5e135490a217522cecc2ae90fe35b33290615827569310a1 ...
Waiting for services to be up and running (timeout 30 seconds)...
Pulling docker image gliderlabs/herokuish:latest ...
Using docker image sha256:9b41eeb129bda7f60a25b0774767dfa79b66ff7e37c6a6c7ca16e28277397afb for gliderlabs/herokuish:latest with digest gliderlabs/herokuish@sha256:339ac08444baa993ac2c3da77caeb7e294a64360868335873d9e868502b12ae7 ...
section_end:1729600941:prepare_executor
section_start:1729600941:prepare_script
Preparing environment
Running on runner-fo1ghkm6a-project-1791-concurrent-0 via gitlab-runner-02.di.unipmn.it...
section_end:1729600942:prepare_script
section_start:1729600942:get_sources
Getting source from Git repository
Fetching changes with git depth set to 20...
Reinitialized existing Git repository in /builds/Ipaolo/app-mobile/.git/
Checking out bf5eed0c as detached HEAD (ref is main)...

Skipping Git submodules setup
section_end:1729600942:get_sources
section_start:1729600942:step_script
Executing "step_script" stage of the job script
Using docker image sha256:9b41eeb129bda7f60a25b0774767dfa79b66ff7e37c6a6c7ca16e28277397afb for gliderlabs/herokuish:latest with digest gliderlabs/herokuish@sha256:339ac08444baa993ac2c3da77caeb7e294a64360868335873d9e868502b12ae7 ...
$ if [ -z ${KUBERNETES_PORT+x} ]; then # collapsed multi-line command
$ export DATABASE_URL="postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${DB_HOST}:5432/${POSTGRES_DB}"
$ cp -R . /tmp/app
$ /bin/herokuish buildpack test
-----> Unable to select a buildpack
section_end:1729600943:step_script
section_start:1729600943:cleanup_file_variables
Cleaning up project directory and file based variables
section_end:1729600943:cleanup_file_variables
ERROR: Job failed: exit code 1