ci: use Vault with certificate (#9)

Author: BernhardFuchs

.github/workflows/maven-deploy-snapshot.yml

@@ -18,9 +18,9 @@ jobs:
       - name: Import Secrets
         uses: hashicorp/[email protected]
         with:
-          url: https://vault.danubetech.com
+          url: ${{ secrets.VAULT_ADDR }}
           token: ${{ secrets.CI_SECRET_READER_PERIODIC_TOKEN }}
-          tlsSkipVerify: true
+          caCertificate: ${{ secrets.VAULTCA }}
           secrets: |
             ci/data/gh-workflows/maven-danubetech-nexus username | MAVEN_USERNAME ;
             ci/data/gh-workflows/maven-danubetech-nexus password | MAVEN_PASSWORD ;