ci: run more tests more often

.github/workflows/ci.yaml

@@ -1,11 +1,7 @@
 name: Server CI
 
 on: # yamllint disable-line rule:truthy
-  pull_request:
-    paths:
-      - "server/**"
-      - "hack/tools/**"
-      - ".github/**"
+  pull_request: {}
   push:
     branches: [main]
 
@@ -17,6 +13,11 @@ jobs:
   unit:
     name: Unit tests
     runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        include:
+          - directory: server
+          - directory: operator
 
     steps:
       - name: Set up Go
@@ -29,7 +30,7 @@ jobs:
 
       - name: Run tests
         # todo: set up code coverage?
-        run: make -C server test
+        run: make -C "${{ matrix.directory }}" test
 
   lint-go:
     name: Lint code
@@ -47,7 +48,7 @@ jobs:
       - name: Determine golang-ci version
         id: golangci_version
         run: |
-          echo "version=$(go mod edit -json | jq '.Require | map(select(.Path == "github.com/golangci/golangci-lint"))[].Version')" >> $GITHUB_OUTPUT
+          echo "version=$(go mod edit -json hack/tools/golang-ci/go.mod | jq '.Require | map(select(.Path == "github.com/golangci/golangci-lint"))[].Version')" >> $GITHUB_OUTPUT
 
       - name: Lint with golang-ci
         uses: golangci/golangci-lint-action@v6