ci: add explicit typecheck step

.gitlab-ci.yml

@@ -6,7 +6,7 @@
 image: node:lts
 
 stages:
-    - test
+    - check
     - build
     - prepare-release
     - release
@@ -17,7 +17,7 @@ cache: &global_cache
         - .yarn/cache
 
 lint:
-    stage: test
+    stage: check
     before_script:
         - yarn install --immutable
     script:
@@ -25,8 +25,17 @@ lint:
     cache:
         <<: *global_cache
 
+typecheck:
+    stage: check
+    before_script:
+        - yarn install --immutable
+    script:
+        - yarn typecheck
+    cache:
+        <<: *global_cache
+
 test:
-    stage: test
+    stage: check
     before_script:
         - yarn install --immutable
     script:
@@ -40,7 +49,7 @@ test:
                 - junit.xml
 
 reuse:
-    stage: test
+    stage: check
     image:
         name: fsfe/reuse:latest
         entrypoint: [""]