[ci] merge test and lint steps to one

.build.yml

@@ -9,10 +9,8 @@ sources:
 tasks:
   - setup: |
       go install honnef.co/go/tools/cmd/staticcheck@latest
-  - test: |
-      make -C undocker coverage.html
-  - lint: |
-      make -C undocker -O -j$(nproc) lint
+  - built-test-lint: |
+      make -C undocker -O -j$(nproc) undocker coverage.html lint
   - usage: |
       # like 'grep -q', but prints output too.
       # | tee /dev/stderr doesn't work on sourcehut workers; permission denied.