Add "latest" tag

.gitlab-ci.yml

@@ -7,7 +7,9 @@ make-targets:
         | jq -r 'map(.tag_name | split(".") | {"maj":.[0:2], "pat":.}) | group_by(.maj) | .[] | max | .pat | join(".")'
         > versions
     - for v in $(cat versions); do
-          sed "s/%OCAML_VERSION%/$v/g" ocaml-image.yml.in >> ocaml-images.yml;
+          sed "s/%OCAML_VERSION%/$v/g; s/%LATEST_OCAML_VERSION%/$(tail -n1 versions)/g"
+            ocaml-image.yml.in
+          >> ocaml-images.yml;
         done
   artifacts:
     paths:

ocaml-image.yml.in

@@ -5,6 +5,7 @@ ocaml-image-%OCAML_VERSION%:
     entrypoint: [""]
   variables:
     OCAML_VERSION: %OCAML_VERSION%
+    LATEST_OCAML_VERSION: %LATEST_OCAML_VERSION%
   script:
     - |
       echo "{
@@ -15,9 +16,13 @@ ocaml-image-%OCAML_VERSION%:
       }}}
       " > /kaniko/.docker/config.json
     - /kaniko/executor --cache=true --reproducible
-          --context $CI_PROJECT_DIR
-          --dockerfile $CI_PROJECT_DIR/Dockerfile
-          --build-arg OCAML_VERSION=$OCAML_VERSION
-          --destination $CI_REGISTRY_IMAGE:${OCAML_VERSION%.*}
+        --context=$CI_PROJECT_DIR
+        --dockerfile=$CI_PROJECT_DIR/Dockerfile
+        --build-arg=OCAML_VERSION=$OCAML_VERSION
+        --destination=$CI_REGISTRY_IMAGE:${OCAML_VERSION%.*}
+        $(if [ "$OCAML_VERSION" = "$LATEST_OCAML_VERSION" ]; then
+            echo "--destination=$CI_REGISTRY_IMAGE:latest";
+          fi)
+
   only:
     - master