Use ci.erlang.mk to track tested OTP versions

Makefile

@@ -7,19 +7,9 @@ PROJECT_REGISTERED = ranch_server
 
 # Options.
 
-COMPILE_FIRST = ranch_transport
 CT_OPTS += -pa test -ct_hooks ranch_ct_hook []
 PLT_APPS = crypto public_key ssl
 
-CI_OTP ?= \
-	OTP_R16B OTP_R16B01 OTP_R16B02 OTP_R16B03-1 \
-	OTP-17.1.2 OTP-17.2.2 OTP-17.3.4 OTP-17.4.1 OTP-17.5.6.6 \
-	OTP-18.0.3 OTP-18.1.5 OTP-18.2.4.1 OTP-18.3.4.5 \
-	OTP-19.0.7 OTP-19.1.6 OTP-19.2.3 OTP-19.3.6.2 \
-	OTP-20.0.5 OTP-20.1.1
-#CI_HIPE ?= $(lastword $(CI_OTP))
-#CI_ERLLVM ?= $(CI_HIPE)
-
 # Dependencies.
 
 LOCAL_DEPS = ssl
@@ -29,15 +19,25 @@ DOC_DEPS = asciideck
 TEST_DEPS = ct_helper
 dep_ct_helper = git https://github.com/ninenines/ct_helper master
 
+# CI configuration.
+
+BUILD_DEPS = ci.erlang.mk
+dep_ci.erlang.mk = git https://github.com/ninenines/ci.erlang.mk master
+DEP_EARLY_PLUGINS = ci.erlang.mk
+
+AUTO_CI_OTP ?= OTP-18+
+AUTO_CI_HIPE ?= OTP-LATEST
+# AUTO_CI_ERLLVM ?= OTP-LATEST
+
 # Standard targets.
 
 include erlang.mk
 
-# Also dialyze the tests.
+# Dialyze the tests.
 
 DIALYZER_OPTS += --src -r test
 
-# Use erl_make_certs from the tested release.
+# Use erl_make_certs from the tested release during CI.
 
 ci-setup:: $(DEPS_DIR)/ct_helper
-	cp ~/.kerl/builds/$(CI_OTP_RELEASE)/otp_src_git/lib/ssl/test/erl_make_certs.erl deps/ct_helper/src/
+	$(gen_verbose) cp ~/.kerl/builds/$(CI_OTP_RELEASE)/otp_src_git/lib/ssl/test/erl_make_certs.erl deps/ct_helper/src/