make variable a string

Author: rithikanarayan

.gitlab-ci.yml

@@ -1,5 +1,5 @@
 variables:
-  SKIP_E2E_TESTS: false
+  SKIP_E2E_TESTS: "false"
 
 stages:
   - pre 

ci/input_files/build.yaml.tpl

@@ -142,7 +142,7 @@ publish-layer-{{ $environment_name }} ({{ $runtime.name }}-{{ $runtime.arch }}):
   tags: ["arch:amd64"]
   image: registry.ddbuild.io/images/docker:20.10-py3
   rules:
-    - if: '$SKIP_E2E_TESTS == true'
+    - if: '$SKIP_E2E_TESTS == "true"'
       when: never
     - if: '"{{ $environment_name }}" == "sandbox" && $REGION == "{{ $e2e_region }}" && "{{ $runtime.arch }}" == "amd64"'
       when: on_success
@@ -250,7 +250,7 @@ e2e-test:
     project: DataDog/serverless-e2e-tests
     strategy: depend
   rules:
-    - if: '$SKIP_E2E_TESTS == true'
+    - if: '$SKIP_E2E_TESTS == "true"'
       when: never
     - when: on_success
   variables:
@@ -274,7 +274,7 @@ e2e-test-status:
   tags: ["arch:amd64"]
   timeout: 3h
   rules:
-    - if: '$SKIP_E2E_TESTS == true'
+    - if: '$SKIP_E2E_TESTS == "true"'
       when: never
     - when: on_success
   script: |