CI: Pipeline: add write permission to Docs Pipeline

Signed-off-by: Karol Gugala <kgugala@antmicro.com>

.github/workflows/Pipeline.yml

diff --git a/.github/workflows/Pipeline.yml b/.github/workflows/Pipeline.yml
index 707b2de..3b23f0e 100644
--- a/.github/workflows/Pipeline.yml
+++ b/.github/workflows/Pipeline.yml
@@ -63,6 +63,8 @@
   Docs:
     runs-on: ubuntu-latest
     name: '📓 Docs'
+    permissions:
+      contents: write
     steps:
 
       - name: 🧰 Checkout