CI: extract .ci/check_if_build_was_already_uploaded

.ci/check_if_build_was_already_uploaded

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+check_directory_exists() {
+  local remote_dir="$1"
+
+  ! curl --output /dev/null --silent --head --fail "$remote_dir"
+}
+
+S3_URL="https://${S3_BUCKET}.s3.amazonaws.com/${S3_BUILD_DIRECTORY}/";
+check_directory_exists "$S3_URL"

.gitlab-ci.yml

@@ -17,9 +17,9 @@ stages:
 test_if_build_was_already_uploaded:
   stage: test_if_build_was_already_uploaded
   script:
+    - apk add bash
     - apk add curl
-    - S3_URL="https://${S3_BUCKET}.s3.amazonaws.com/${S3_BUILD_DIRECTORY}/";
-    - ! curl --output /dev/null --silent --head --fail "$S3_URL"
+    - .ci/check_if_build_was_already_uploaded
 
 .prepare_build: &prepare_build
   - ls -l