test: add example-config validation

Author: superstes

.github/workflows/unit_test.yml

@@ -9,12 +9,14 @@ on:
       - '**.go'
       - '.github/workflows/unit_test.yml'
       - 'scripts/unit_test.sh'
+      - 'examples/acme.yml'
   pull_request:
     branches: [latest]
     paths:
       - '**.go'
       - '.github/workflows/unit_test.yml'
       - 'scripts/unit_test.sh'
+      - 'examples/acme.yml'
   workflow_dispatch:
 
 jobs:
@@ -64,4 +66,4 @@ jobs:
         run: bash scripts/unit_test.sh
 
       - name: Testing check-mode (validating example-config)
-        run: build/acme -path-cnf examples/acme.yml -check
+        run: build/acme -path-cnf $(pwd)/examples/acme.yml -check