Add gitlab release job (#184)

* add release script

* add gitlab workflow

* remove VERSION, the script use the VERSION file

* install zip in the before_script

* set VERSION var to the file content

* PLINT-259

* apply suggestions

.gitlab-ci.yml

@@ -0,0 +1,22 @@
+variables:
+    RELEASE_BUCKET:
+      value: "cloudfoundry.datadoghq.com/datadog-cloudfoundry-buildpack"
+      description: "Bucket where the buildpack release will be stored"
+    DRY_RUN:
+      value: "true"
+      description: "Set to true to do a dry run"
+    REPO_BRANCH:
+      value: "master"
+      description: "The branch to use"
+
+
+buildpack-prod-release:
+  stage: deploy
+  image: 486234852809.dkr.ecr.us-east-1.amazonaws.com/ci/datadog-agent-builders/gitlab_agent_deploy:v6554890-8eae026
+  tags: ["runner:main"]
+  when: manual
+  before_script:
+    - apt-get update -y && apt-get install -y zip
+  script:
+    - 'export PRODUCTION=true'
+    - ./scripts/release.sh

scripts/release.sh

@@ -0,0 +1,39 @@
+#!/bin/bash -l
+
+# http://redsymbol.net/articles/unofficial-bash-strict-mode/
+IFS=$'\n\t'
+set -euxo pipefail
+
+# Make sure variables are set
+PRODUCTION=${PRODUCTION:-"false"}
+STAGING=${STAGING:-"false"}
+DRY_RUN=${DRY_RUN:-"true"}
+RELEASE_BUCKET=${RELEASE_BUCKET:-"false"}
+REPO_BRANCH=${REPO_BRANCH:-"master"}
+
+
+VERSION=$(cat VERSION)
+
+git checkout $REPO_BRANCH
+
+echo "Preparing the buildpack"
+REFRESH_ASSETS=1 ./scripts/prepare.sh
+
+echo "Building the buildpack version $VERSION"
+./scripts/build.sh
+
+if [ "$DRY_RUN" == "true" ]; then
+  exit 0
+fi
+
+
+echo "publishing the buildpack artifact"
+
+if [ "$RELEASE_BUCKET" -a "$RELEASE_BUCKET" != "false" ]; then
+  if [ "$PRODUCTION" = "true" ]; then
+    # the production release bucket is cloudfoundry.datadoghq.com/datadog-cloudfoundry-buildpack
+    aws s3 cp datadog-cloudfoundry-buildpack-$VERSION.zip s3://$RELEASE_BUCKET/datadog-cloudfoundry-buildpack-$VERSION.zip --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers full=id=3a6e02b08553fd157ae3fb918945dd1eaae5a1aa818940381ef07a430cf25732
+
+    aws s3 cp datadog-cloudfoundry-buildpack-$VERSION.zip s3://$RELEASE_BUCKET/datadog-cloudfoundry-buildpack-latest.zip --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers full=id=3a6e02b08553fd157ae3fb918945dd1eaae5a1aa818940381ef07a430cf25732
+  fi
+fi