fix(ci): set fail-fast false for molecule matrix

With fail-fast: true, Gitea cancels remaining matrix slots when one
fails. Combined with molecule_ci_guard's cross-runner cancellation,
a single DinD failure on a high-disk runner kills all 4 slots.

Setting fail-fast: false lets slots on healthy runners complete even
if slots on high-disk runners fail.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitea/workflows/ci.yml

@@ -160,7 +160,7 @@ jobs:
     container: git.oblachno.oblachno.fyi/oblachno-oss/runner-images/ci-full:latest
     timeout-minutes: 15
     strategy:
-      fail-fast: true
+      fail-fast: false
       max-parallel: 4
       matrix:
         runner-index: [1, 2, 3, 4]