ci: synchronous zunit tests

.github/workflows/tests.yaml

@@ -68,12 +68,20 @@ jobs:
           git clone --depth 1 https://github.com/zdharma-continuum/zunit; cd ./zunit
           zsh -l -c './build.zsh' && sudo chmod u+x ./zunit && cp ./zunit "$HOME/.local/bin/"
 
-      - name: Run tests
-        shell: zsh {0}
-        run: |
-          command -p ls -1 ./tests/*zunit \
-            | parallel \
-            --jobs=4 \
-            --keep-order \
-            --line-buffer \
-            $HOME/.local/bin/zunit run
+      - name: "annexes"
+        run: zunit run tests/annexes.zunit
+      
+      - name: "commands"
+        run: zunit run tests/commands.zunit
+        
+      - name: "gh-r"
+        run: zunit run --fail-fast --verbose tests/gh-r.zunit
+      
+      - name: "ices"
+        run: zunit run tests/ices.zunit
+      
+      - name: "plugins"
+        run: zunit run tests/plugins.zunit
+      
+      - name: "snippets"
+        run: zunit run tests/snippets.zunit