GitLab - Platform.sh CI scripts

.gitlab-ci.yml

stages:
    - review
    - cleanup

variables:
    # The Platform.sh project ID.
    PF_PROJECT_ID: abcdefg123456    

push-platformsh:
    # This Docker image installs the Platform.sh CLI (and PHP, Git and SSH).
    # An environment variable PLATFORMSH_CLI_TOKEN (containing an API token) is
    # the recommended way to authenticate for the CLI.
    image: pjcdawkins/platformsh-cli
    stage: review
    script:
        # Install an SSH key pair set via GitLab CI environment variables
        # (SSH_KEY, SSH_KEY_PUB, and SSH_KNOWN_HOSTS).
        - 'bash setup-ssh.sh'

        # Push the branch to a Platform.sh Standard environment.
        - 'bash push-platform.sh'
    artifacts:
      reports:
        dotenv: environment.env
    environment:
        name: review/$CI_COMMIT_REF_SLUG
        # The PRIMARY_URL is set by the push-platform.sh script and the "dotenv" artifact.
        url: $PRIMARY_URL
        on_stop: delete-platformsh
    only:
        - branches
    except:
        # This excludes the master branch from attempted pushes, on the
        # assumption that one might want to make master pushes manually.
        - master

delete-platformsh:
    stage: cleanup
    image: pjcdawkins/platformsh-cli
    script:
        - 'bash delete-platform.sh'
    when: manual
    environment:
        name: review/$CI_COMMIT_REF_SLUG
    action: stop
    only:
        - branches
    except:
        - master

delete-platform.sh

#!/usr/bin/env bash
set -e

# Config.
if [ -z "$PF_PROJECT_ID" ]; then
  echo "PF_PROJECT_ID is required"
  exit 1
fi

PF_BRANCH=${PF_DEST_BRANCH:-$CI_COMMIT_REF_SLUG}

if [ -z "$PF_BRANCH" ]; then
  echo "Branch name (CI_COMMIT_REF_SLUG or PF_DEST_BRANCH) not defined."
  exit 1
fi

# Delete the specified branch.
platform environment:delete --yes --no-wait --project="$PF_PROJECT_ID" --environment="$PF_BRANCH"

# Clean up inactive environments.
platform environment:delete --project="$PF_PROJECT_ID" --inactive --exclude=master --yes --delete-branch --no-wait || true

push-platform.sh

#!/usr/bin/env bash
set -e

# Push Gitlab branches to Platform.sh environments.
# -------------------------------------------------
#
# This script can be configured by specifying environment variables in your
# repository settings or in the .gitlab-ci.yml file:
#
# variables:
#
#     # The project ID (required).
#     PF_PROJECT_ID: abcdefg123456
#
#     # The parent environment of new branches.
#     PF_PARENT_ENV: master

# Config.
if [ -z "$PF_PROJECT_ID" ]; then
  echo "PF_PROJECT_ID is required"
  exit 1
fi

PF_PARENT_ENV=${PF_PARENT_ENV:-master}
ALLOW_MASTER=${ALLOW_MASTER:-0}

export PLATFORMSH_CLI_NO_INTERACTION=1

if [ -z "$CI_COMMIT_REF_SLUG" ]; then
  echo "Source branch (CI_COMMIT_REF_SLUG) not defined."
  exit 1
fi

BRANCH=$CI_COMMIT_REF_SLUG

# This script is not for production deployments.
if [ "$BRANCH" = "master" ] && [ "$ALLOW_MASTER" != 1 ]; then
  echo "Not pushing master branch."
  exit
fi

# Set the project for further CLI commands.
platform project:set-remote "$PF_PROJECT_ID"

# Get a URL to the web UI for this environment, before pushing.
pf_ui=$(platform web --environment="$BRANCH" --pipe)
echo ""
echo "Web UI: ${pf_ui}"
echo ""

# Build the push command.
push_command="platform push --force --target=${BRANCH}"
if [ "$PF_PARENT_ENV" != "$BRANCH" ]; then
  push_command="$push_command --activate --parent=${PF_PARENT_ENV}"
fi

# Run the push command.
$push_command

# Write the environment's primary URL to a dotenv file.
# This can be used by a GitLab job via the "dotenv" artifact type.
echo "PRIMARY_URL=$(platform url --primary --pipe --yes --environment=${BRANCH})" > environment.env
# Clean up already merged and inactive environments.
platform environment:delete --inactive --merged --environment="$PF_PARENT_ENV" --exclude=master --exclude=development --exclude="$BRANCH" --yes --delete-branch --no-wait || true

setup-ssh.sh

#!/usr/bin/env bash
set -e

# Set up SSH credentials for pushing to external Git repositories, via GitLab CI
# environment variables. You should add this public key to a Platform user for
# the push to be successful.

if [ -n "$SSH_KEY" ]; then
  mkdir -p $HOME/.ssh
  echo "$SSH_KEY" > $HOME/.ssh/id_rsa
  echo "$SSH_KEY_PUB" > $HOME/.ssh/id_rsa.pub

  # Some vague semblance of security for the private key.
  chmod go-r $HOME/.ssh/id_rsa
  unset SSH_KEY

  echo "Created SSH key: .ssh/id_rsa"
fi

# Set up SSH known hosts file.
if [ -n "$SSH_KNOWN_HOSTS" ]; then
  mkdir -p $HOME/.ssh
  echo "$SSH_KNOWN_HOSTS" > $HOME/.ssh/known_hosts
fi

Ah, that issue was moved to https://gitlab.com/gitlab-org/gitlab/issues/17066 and it looks like they're willing to work on a simpler solution

That's now available in GitLab (since version 12.9), so I've updated the gist to set the environment URL dynamically.