add artifacts

.gitlab.ci.yml

@@ -5,4 +5,9 @@ build-firefox-extension:
   script:
     - yarn install
     - yarn build
-    - yarn web-ext sign --api-key=${MOZ_API_KEY} --api-secret=${MOZ_API_SECRET} --id=${MOZ_GECKO_ID} -s src/
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+    - yarn web-ext sign --api-key=${MOZ_API_KEY} --api-secret=${MOZ_API_SECRET} --id=${MOZ_GECKO_ID} -s src/
+    - mv web-ext-artifacts/*.xpi ./url-shorter-xpi
+    - mv web-ext-artifacts/*.zip ./url-shorter-zip
+  artifacts:
+    - public/url-shorter-xpi
+    - public/url-shorter-zip
\ No newline at end of file