feat: add skill validation CI job

Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

Author: CybotTM

.github/workflows/lint.yml

@@ -15,3 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: DavidAnson/markdownlint-cli2-action@07035fd053f7be764496c0f8d8f9f41f98305101 # v22.0.0
+
+  validate:
+    name: Skill Validation
+    uses: netresearch/skill-repo-skill/.github/workflows/validate.yml@main