add test workflow in CI

.gitlab-ci.yml

-# recipe for building singularity image and deploy it on the registery for bwa version 0.7.17
-image:
-   name: quay.io/singularity/singularity:v3.4.0
-   entrypoint: [""]
-
 stages:
  - build
  - deploy
-
+ - test
 # Build Singularity container bwa_v0.7.17.sif
 singularity-image:
+   # recipe for building singularity image and deploy it on the registery for bwa version 0.7.17
+   image:
+      name: quay.io/singularity/singularity:v3.4.0
+
    stage: build
    script:
        - singularity build template.sif Singularityfile
@@ -23,6 +22,8 @@ singularity-image:
 
 # Push the image template.sif on the registry
 deploy:
+   image:
+      name: quay.io/singularity/singularity:v3.4.0
    stage: deploy
    script:
        - singularity push --docker-username "${CI_REGISTRY_USER}" --docker-password "${CI_REGISTRY_PASSWORD}" template.sif oras://"$CI_REGISTRY_IMAGE"/"$CI_PROJECT_NAME":"$CI_COMMIT_TAG"
@@ -30,4 +31,13 @@ deploy:
       changes:
          - .gitlab-ci.yml
          - Singularityfile
-         - emvironement.yml
\ No newline at end of file
+         - emvironement.yml
+test:
+   image: nextflow/nextflow
+   stage: test
+   push:
+      script:
+         - git clone git clone git@forgemia.inra.fr:get-nextflow-ngl-bi/template-nf.git
+         - cd template-nf
+         - ln -s template.sif template-nf.sif 
+         - nextflow run main.nf -profile test,singularity