ci: add staticcheck lint job and Go version matrix for unit tests

.github/workflows/integration.yml

@@ -6,18 +6,34 @@ on:
     branches: [master]
 
 jobs:
-  unit-tests:
-    name: Unit Tests
+  lint:
+    name: Lint
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
-      - run: go build ./...
+      - name: Install staticcheck
+        run: go install honnef.co/go/tools/cmd/staticcheck@latest
       - run: go vet ./...
+      - run: staticcheck ./...
+
+  unit-tests:
+    name: Unit Tests (Go ${{ matrix.go-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: ['1.25', '1.26']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+      - run: go build ./...
       - run: go test -race -coverprofile=coverage-unit.out ./...
       - uses: actions/upload-artifact@v4
+        if: matrix.go-version == '1.26'
         with:
           name: coverage-unit
           path: coverage-unit.out
@@ -174,7 +190,7 @@ jobs:
   codecov:
     name: Upload Coverage
     runs-on: ubuntu-latest
-    needs: [unit-tests, debian, ubuntu, fedora-dnf4, fedora-dnf5, alpine, arch, flatpak]
+    needs: [lint, unit-tests, debian, ubuntu, fedora-dnf4, fedora-dnf5, alpine, arch, flatpak]
     if: always()
     steps:
       - uses: actions/checkout@v4