CI: employ caching

.gitignore

@@ -16,3 +16,4 @@ dev.config
 /_projects/
 /_steps/
 /_temp/
+ci/rebar.config

Makefile

@@ -19,3 +19,11 @@ distclean:
 
 dialyze:
 	$(REBAR) dialyzer
+
+CI_CONFIG := ci/rebar.config
+
+%-ci: $(CI_CONFIG)
+	$(MAKE) REBAR_CONFIG=$(CI_CONFIG) $*
+
+$(CI_CONFIG): %: %.template
+	$(CURDIR)/template.sh "$<" >> "$@"

ci/rebar.config.template

@@ -0,0 +1 @@
+{dialyzer, [{base_plt_location, "${WERCKER_CACHE_DIR}"}]}.

template.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+eval "cat <<EOF
+$(<$1)
+EOF"

wercker.yml

@@ -10,7 +10,7 @@ build:
         code: make test
       - script:
         name: run dialyzer
-        code: make dialyze
+        code: make dialyze-ci
     after-steps:
       - slack-notifier:
         url: ${SLACK_WEBHOOK_URL}