refactor(ci): 👷 add small smoketest to build pipeline which veryfies …

…that borg is working.

.github/workflows/docker-build.yml

@@ -78,6 +78,9 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
+      - name: Run small selftest on build container image
+        run: docker run -v "./tests/selftest.sh:/selftest.sh" "ghcr.io/anotherstranger/borg-server:sha-${{ github.sha }}" ./selftest.sh
+
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@master
         if: ${{ github.event_name != 'pull_request' }}

tests/selftest.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+set -euxo pipefail
+
+# This file povides a simple smoketest for the build borg binary within the container image
+# In this file, we first try to print the borg version, then we try to create a repo and verify its existence.
+# In the last step we try to backup a single file.
+
+# Error handling function
+error_handler() {
+    echo "There was an error while performing the self test."
+    exit 1
+}
+trap 'error_handler' ERR
+
+
+export BORG_REPO=/home/borg/backups/test-repo
+export BORG_PASSPHRASE="test"
+
+# Print version
+borg version
+
+# Initialize a BorgBackup repository
+borg init --encryption repokey
+
+# Check that the repository was created successfully
+borg list
+
+# backup single file and try to restore it.
+echo "Hello, World!" > testfile.txt
+borg create ::test ./testfile.txt
+
+# restore backup
+mkdir restored
+cd restored
+borg extract ::test
+
+# Compare file with original
+cmp -s ../testfile.txt ./testfile.txt || exit 1
+
+echo "Selftest finished without errors."