add init gcs backend script

init_tf_backend_gcs.sh

@@ -0,0 +1,84 @@
+#!/bin/bash
+#
+# The purpose of this script is to provision the resources needed to store
+# terraform states on GCS. It will provision a bucket on Google gcs. This backend
+# supports state locking by default.
+#
+# Official documentation about terraform state in gcs =>
+# https://www.terraform.io/language/settings/backends/gcs
+
+REGION=eu
+NAME=
+PROJECT=quortex-199114
+PUBLIC_ACCESS=off
+INTERACTIVE=true
+
+function help() {
+    cat <<EOF
+Provision the resources needed to store terraform states on GCS.
+It will provision a bucket on Google gcs. This backend
+supports state locking by default.
+Usage : $0 -n NAME [options]
+
+Mandatory arguments :
+    -n NAME      Set the name of created resources.
+Available options :
+    -r REGION                   Specify the region in which to create the resources (default $REGION).
+    -p PROJECT                  Specify the project name (default $PROJECT)
+    -b PUBLIC_ACCESS            Whether to block public access for gcs bucket (default $PUBLIC_ACCESS)
+    -y                          Execute script in non interactive mode.
+    -h                          Display this help.
+EOF
+}
+
+while getopts "n:r:p:b:yh" opt; do
+    case "$opt" in
+    h)
+        help
+        exit 0
+        ;;
+    n)
+        NAME=$OPTARG
+        ;;
+    r)
+        REGION=$OPTARG
+        ;;
+    p)
+        PROJECT=$OPTARG
+        ;;
+    b)
+        PUBLIC_ACCESS=$OPTARG
+        ;;
+    y)
+        INTERACTIVE=false
+        ;;
+    esac
+done
+
+if [ "$NAME" == "" ]; then
+    echo "Name was not specified, aborting !"
+    exit 1
+fi
+
+bucket_name="$PROJECT-tfstate-$NAME"
+
+if [ "$INTERACTIVE" == true ]; then
+    echo "This will create a gcs bucket on $PROJECT project named $bucket_name"
+    echo "In region $REGION"
+    echo ""
+    read -p "Continue (y/n)?" CONT
+    if [ "$CONT" != "y" ]; then
+        echo "Aborting !";
+        exit 0
+    fi
+fi
+
+# create GCS bucket
+
+echo "Creating bucket : ${bucket_name}"
+gsutil mb -p $PROJECT -l $REGION -b $PUBLIC_ACCESS gs://$bucket_name
+
+
+# add self as admin
+my_user=$(gcloud config get account)
+gsutil iam ch user:${my_user}:admin gs://$bucket_name