Merge pull request #54 from tuncer/apk-add-make

gitlab-ci: add make in alpine image
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1dbf61e..3bb75a8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -23,6 +23,8 @@
 .build_job_template: &build_job_definition
   stage: build
   image: erlang:20-alpine
+  before_script:
+    - apk add --update make
   script:
     - make ci
 
@@ -67,10 +69,14 @@
 
 test:20:
   <<: *test_job_definition
+  before_script:
+    - apk add --update make
   image: erlang:20-alpine
 
 test:dialyze:
   stage: test
   image: erlang:20-alpine
+  before_script:
+    - apk add --update make
   script:
-    - make ci-dialyze
+    - make ci-dialyze
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