ci(frontend-2): docker image should not be built if github token is not set (#1687)

.circleci/config.yml

@@ -64,6 +64,7 @@ workflows:
             - get-version
 
       - docker-build-frontend-2:
+          context: *build-context
           filters: *filters-build
           requires:
             - get-version

.circleci/is_draft.sh

@@ -4,10 +4,15 @@
 
 set -euf -o pipefail
 
-if [[ -z "$CIRCLE_PULL_REQUEST" ]]; then
+if [[ -z "${CIRCLE_PULL_REQUEST}" ]]; then
   echo "FALSE"
 fi
 
+if [[ -z "${GITHUB_TOKEN}" ]]; then
+  echo "GITHUB_TOKEN is not set"
+  exit 1
+fi
+
 PR_NUMBER="${CIRCLE_PULL_REQUEST//[!0-9]/}"
 RESPONSE=$(curl --silent \
   -H "Authorization: token ${GITHUB_TOKEN}" \