👷 Improve cli import/install test, to work with PRs from forks

.github/workflows/pr.yml

@@ -34,15 +34,18 @@ jobs:
           paths: "test-result.xml"
         if: always()
 
-  cli-install:
+  cli-import-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
           go-version: 1.21.0
 
-      - name: Install CLI
-        run: go install github.com/${{ github.repository }}/cmd/rig@${{ github.event.pull_request.head.sha }}
+      - name: Test cli import
+        run: |
+          go mod init example.com
+          go mod edit -replace github.com/rigdev/rig=github.com/${{ github.event.pull_request.head.repo.owner.login }}/${{ github.event.pull_request.head.repo.name }}@${{ github.event.pull_request.head.sha }}
+          echo -e 'package main\nimport (\n	_ "github.com/rigdev/rig/cmd/rig/cmd"\n)\nfunc main() {\n}\n' > main.go
+          go mod tidy
+          go run ./main.go