move travis job manual vars into makefile

Makefile

@@ -1,3 +1,9 @@
+# Default values used by tests
+GITHUB_EMAIL ?= foo@form3.tech
+GITHUB_USERNAME ?= foo
+TF_ACC ?= 1
+COMMIT_MESSAGE_PREFIX ?= '[foo]'
+
 default: vet test build
 
 .PHONY: build
@@ -10,4 +16,8 @@ vet:
 
 .PHONY: test
 test:
+	GITHUB_EMAIL=$(GITHUB_EMAIL) \
+	GITHUB_USERNAME=$(GITHUB_USERNAME) \
+	COMMIT_MESSAGE_PREFIX=$(COMMIT_MESSAGE_PREFIX) \
+	TF_ACC=$(TF_ACC) \
 	go test -count 1 -v ./...