Deploying to feature branches & dev

.ci\deploy\pantheon\dev-multidev

...

echo "Ready to deploy to Pantheon"

if [[ $CI_BRANCH != $DEFAULT_BRANCH ]]
then
    echo "Pushing to a multidev environment."
    ENV_EXISTS=$(terminus env:list "$TERMINUS_SITE" --field=id | grep "^$TERMINUS_ENV$" || true)

    if [[ $ENV_EXISTS ]]
    then
        echo "Multidev environment already exists. Pushing to it."
        # Push to the multidev environment if it exists
        terminus -n build:env:push "$TERMINUS_SITE.$TERMINUS_ENV" --yes
    else 
        echo "Multidev environment does not exist. Creating it."
        # Create a new multidev environment (or push to an existing one)
        terminus -n build:env:create "$TERMINUS_SITE.dev" "$TERMINUS_ENV" --yes
    fi
else
    echo "Pushing to the dev environment."
    # Push to the dev environment
    terminus -n build:env:push "$TERMINUS_SITE.dev" --yes
fi

....

.github\workflows\build_deploy_and_test.yml

name: Build, deploy and test
on: push
...

env:
...
  CI_BRANCH: ${{ github.ref_name }}
...

jobs:
  configure_env_vars:
...
    steps:
...      
      - name: setup-environment-vars
        run: |
          if [ "$CI_BRANCH" != "master" ]; then
            export PR_NUMBER=`curl -u "${GITHUB_OWNER}:${GITHUB_TOKEN}" \
              -H "Accept: application/vnd.github.groot-preview+json" \
              "https://api.github.com/repos/${CI_PROJECT_NAME}/commits/${COMMIT_SHA}/pulls" | \
              python3 -c "import sys, json; print(json.load(sys.stdin)[0]['number'])"`

            export CI_PULL_REQUEST=`curl -u "${GITHUB_OWNER}:${GITHUB_TOKEN}" \
              -H "Accept: application/vnd.github.groot-preview+json" \
              "https://api.github.com/repos/${CI_PROJECT_NAME}/commits/${COMMIT_SHA}/pulls" | \
              python3 -c "import sys, json; print(json.load(sys.stdin)[0]['html_url'])"`

              export TERMINUS_ENV="${CI_BRANCH:0:11}"
          else
            export CI_BRANCH="master"
            export TERMINUS_ENV="dev"
          fi

          export CI_PROJECT_REPONAME=`curl -u "${GITHUB_OWNER}:${GITHUB_TOKEN}" \
            -H "Accept: application/vnd.github.groot-preview+json" \
            "https://api.github.com/repos/${CI_PROJECT_NAME}/commits/${COMMIT_SHA}/pulls" | \
            python3 -c "import sys, json; print(json.load(sys.stdin)[0]['base']['repo']['name'])"`
          export CI_PROJECT_USERNAME=$GITHUB_REPOSITORY_OWNER

          /build-tools-ci/scripts/set-environment
          echo "export TERMINUS_ENV='$TERMINUS_ENV'" >> $BASH_ENV
          GITHUB_WORKFLOW_URL=https://github.com/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID
          echo "export CI_BUILD_URL='${GITHUB_WORKFLOW_URL}'" >> $BASH_ENV
          echo "export CI_NODE_INDEX=0" >> $BASH_ENV
          echo "export CI_REPOSITORY_URL='https://github.com/${GITHUB_REPOSITORY}'" >> $BASH_ENV
          echo "export ARTIFACTS_DIR_URL='${GITHUB_WORKFLOW_URL}/#artifacts'" >> $BASH_ENV
...