added environment argument for golang version

Dockerfile.test

@@ -1,4 +1,7 @@
-FROM golang:1.12
+ARG GOLANG_VERSION=latest
+FROM golang:$GOLANG_VERSION
+
+RUN echo $GOLANG_VERSION
 
 RUN mkdir -p /athens/tests
 

Makefile

@@ -1,5 +1,10 @@
 VERSION = "unset"
 DATE=$(shell date -u +%Y-%m-%d-%H:%M:%S-%Z)
+
+ifndef GOLANG_VERSION
+override GOLANG_VERSION = latest
+endif
+
 .PHONY: build
 build: ## build the athens proxy
 	cd cmd/proxy && go build
@@ -47,7 +52,8 @@ test-unit: ## run unit tests with race detector and code coverage enabled
 
 .PHONY: test-unit-docker
 test-unit-docker: ## run unit tests with docker
-	docker-compose -p athensunit up --exit-code-from=testunit --build testunit
+	docker-compose -p athensunit build --build-arg GOLANG_VERSION=${GOLANG_VERSION} testunit	
+	docker-compose -p athensunit up --exit-code-from=testunit testunit
 	docker-compose -p athensunit down
 
 .PHONY: test-e2e
@@ -56,7 +62,8 @@ test-e2e:
 
 .PHONY: test-e2e-docker
 test-e2e-docker:
-	docker-compose -p athense2e up --build --exit-code-from=teste2e teste2e
+        docker-compose -p athense2e build --build-arg GOLANG_VERSION=${GOLANG_VERSION} teste2e
+	docker-compose -p athense2e up --exit-code-from=teste2e teste2e
 	docker-compose -p athense2e down
 
 .PHONY: docker

docker-compose.yml

@@ -17,6 +17,8 @@ services:
     build:
       context: .
       dockerfile: Dockerfile.test
+      args:
+        GOLANG_VERSION: latest
     command: ["./scripts/test_unit.sh"]
     environment:
       - GO_ENV=test
@@ -31,6 +33,8 @@ services:
     build:
       context: .
       dockerfile: Dockerfile.test
+      args:
+        GOLANG_VERSION: latest
     command: ["./scripts/test_e2e.sh"]
   azurite:
     image: arafato/azurite:2.6.5

go.sum

@@ -6,8 +6,10 @@ git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999 h1:OR8VhtwhcAI3U48/
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
 github.com/Azure/azure-pipeline-go v0.1.8 h1:KmVRa8oFMaargVesEuuEoiLCQ4zCCwQ8QX/xg++KS20=
 github.com/Azure/azure-pipeline-go v0.1.8/go.mod h1:XA1kFWRVhSK+KNFiOhfv83Fv8L9achrP7OxIzeTn1Yg=
+github.com/Azure/azure-pipeline-go v0.2.1/go.mod h1:UGSo8XybXnIGZ3epmeBw7Jdz+HiUVpqIlpz/HKHylF4=
 github.com/Azure/azure-storage-blob-go v0.0.0-20181022225951-5152f14ace1c h1:Y5ueznoCekgCWBytF1Q9lTpZ3tJeX37dQtCcGjMCLYI=
 github.com/Azure/azure-storage-blob-go v0.0.0-20181022225951-5152f14ace1c/go.mod h1:oGfmITT1V6x//CswqY2gtAHND+xIP64/qL7a5QJix0Y=
+github.com/Azure/azure-storage-blob-go v0.7.0/go.mod h1:f9YQKtsG1nMisotuTPpO0tjNuEjKRYAcJU8/ydDI++4=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/DataDog/datadog-go v0.0.0-20180822151419-281ae9f2d895 h1:dmc/C8bpE5VkQn65PNbbyACDC8xw8Hpp/NEurdPmQDQ=
@@ -144,6 +146,7 @@ github.com/markbates/hmax v1.0.0 h1:yo2N0gBoCnUMKhV/VRLHomT6Y9wUm+oQQENuWJqCdlM=
 github.com/markbates/hmax v1.0.0/go.mod h1:cOkR9dktiESxIMu+65oc/r/bdY4bE8zZw3OLhLx0X2c=
 github.com/mattn/go-colorable v0.0.9 h1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRUIY4=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
+github.com/mattn/go-ieproxy v0.0.0-20190610004146-91bb50d98149/go.mod h1:31jz6HNzdxOmlERGGEc4v/dMssOfmp2p5bT/okiKFFc=
 github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=