gitlab-ci: Run all the tests

Use -stretch images because libpam-wrapper is not in jessie.
Drop go1.7 because there is no go1.7-stretch image.

.gitlab-ci.yml

@@ -11,28 +11,21 @@ before_script:
     - ln -s /builds /go/src/gitlab.cs.fau.de
     - cd /go/src/gitlab.cs.fau.de/koomi/goatherd
     - go get -d
+    - export PGHOST=postgres PGUSER=$POSTGRES_USER PGPASSWORD=$POSTGRES_PASSWORD PGSSLMODE=disable
     - export DB_URL="host=postgres user=$POSTGRES_USER password=$POSTGRES_PASSWORD sslmode=disable"
-
-go1.7:
-    image: golang:1.7
-    script:
-        - go build goatherd.go
-        - sh test_pg.sh
-    tags:
-        - shared runner
+    - apt update
+    - apt install --yes libpam0g-dev libgnutls28-dev libpam-wrapper pamtester oathtool postgresql xxd
 
 go1.8:
-    image: golang:1.8
+    image: golang:1.8-stretch
     script:
-        - go build goatherd.go
-        - sh test_pg.sh
+        - make test
     tags:
         - shared runner
 
 go1.9:
-    image: golang:1.9
+    image: golang:1.9-stretch
     script:
-        - go build goatherd.go
-        - sh test_pg.sh
+        - make test
     tags:
         - shared runner