CI: Pass package name and switch to opam2 containers.

Author: paurkedal

.travis.yml

@@ -6,13 +6,14 @@ services:
 
 env:
   matrix:
-    - IMAGE_NAME=ocaml/opam:alpine_ocaml-4.02.3         PKG_NAME=ppx_regexp
-    - IMAGE_NAME=ocaml/opam:alpine_ocaml-4.02.3         PKG_NAME=ppx_tyre
-    - IMAGE_NAME=ocaml/opam:alpine_ocaml-4.06.0_flambda PKG_NAME=ppx_regexp
-    - IMAGE_NAME=ocaml/opam:alpine_ocaml-4.06.0_flambda PKG_NAME=ppx_tyre
+    - IMAGE_NAME=ocaml/opam2:4.03 PKG_NAME=ppx_regexp
+    - IMAGE_NAME=ocaml/opam2:4.03 PKG_NAME=ppx_tyre
+    - IMAGE_NAME=ocaml/opam2:4.07 PKG_NAME=ppx_regexp
+    - IMAGE_NAME=ocaml/opam2:4.07 PKG_NAME=ppx_tyre
 
 before_install:
   - docker pull $IMAGE_NAME
 
 script:
-  - docker run --privileged -v `pwd`:/mnt:ro $IMAGE_NAME /mnt/.travis.sh
+  - docker run --privileged -v `pwd`:/mnt:ro --env PKG_NAME=$PKG_NAME
+        $IMAGE_NAME /mnt/.travis.sh