fix: forceer bash installatie in alpine runner container

.gitea/workflows/renovate.yaml

@@ -8,6 +8,8 @@ jobs:
   renovate:
     runs-on: ubuntu-latest
     steps:
+      - name: Install Bash in Alpine
+        run: "if [ -f /etc/alpine-release ]; then apk add --no-cache bash; fi"
       - name: Self-hosted Renovate
         run: |
           set -e