[enh] #96 add manual release_test job to upload on test.pypi.org

.gitlab-ci.yml

@@ -54,6 +54,11 @@ image: registry.duniter.org/docker/python3/duniterpy-builder:0.0.4
     - pip install twine
     - twine upload dist/* --username duniter --password $PYPI_PASSWORD
 
+.release_pip_test: &release_pip_test
+  script:
+    - pip install twine
+    - twine upload dist/* --username duniter --password $PYPI_PASSWORD --repository-url https://test.pypi.org/legacy/
+
 # TASKS
 format:
   <<: *pyenv
@@ -101,3 +106,9 @@ releases:
   stage: release
   when: manual
 
+release_test:
+  <<: *pyenv
+  <<: *build
+  <<: *release_pip_test
+  stage: release
+  when: manual
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