gitlab-ci.yml: Run integration tests against submitted and latest deps

It is useful to run the integration tests both against the submitted
dependencies, based on Go module versions from the repository, as well
as the latest ones, to catch integration problems early.

This patch extends the .gitlab-ci.yml configuration to do that, by
optionally passing a flag to "go get" to update the modules.

.gitlab-ci.yml

@@ -3,6 +3,7 @@ stages:
   - test
   - docker_image
 
+# Integration test, using the module versions from the repository.
 integration_test:
   stage: test
   image: docker:stable
@@ -14,6 +15,18 @@ integration_test:
     - docker run chasquid-test  env
     - docker run chasquid-test  make test
 
+# Integration test, using the latest module versions.
+integration_test_latest:
+  stage: test
+  image: docker:stable
+  services:
+    - docker:dind
+  script:
+    - docker info
+    - docker build -t chasquid-test --build-arg GO_GET_ARGS="-u=patch" -f test/Dockerfile .
+    - docker run chasquid-test  env
+    - docker run chasquid-test  make test
+
 image_build:
   stage: docker_image
   image: docker:stable

test/Dockerfile

@@ -56,7 +56,7 @@ RUN useradd -m chasquid && chown -R chasquid:chasquid .
 # Do it as chasquid because that is what the tests will run as.
 USER chasquid
 ENV GOPATH=
-RUN go get -v ./... && go mod download
+RUN go get -v ${GO_GET_ARGS} ./... && go mod download
 
 # Build the minidns server, which will be run from within the entrypoint.
 RUN go build -o /tmp/minidns ./test/util/minidns.go