ci: add smoke test for htpasswd

tests/test.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+set -euo pipefail
+
+IMAGE="$1"
+FAILED=0
+PASSED=0
+
+assert_contains() {
+  local desc="$1" pattern="$2" file="$3"
+  if grep -qEi "$pattern" "$file"; then
+    echo "PASS: $desc"
+    PASSED=$((PASSED + 1))
+  else
+    echo "FAIL: $desc"
+    FAILED=$((FAILED + 1))
+  fi
+}
+
+TMPDIR="$(mktemp -d)"
+trap 'rm -rf "$TMPDIR"' EXIT
+
+# Test 1: Container runs without error
+docker run --rm "$IMAGE" -nb user pass > "$TMPDIR/output" 2>&1 || true
+assert_contains "Command produces output" "apr1|sha" "$TMPDIR/output"
+
+echo ""
+echo "$PASSED/$((PASSED + FAILED)) tests passed"
+if [ "$FAILED" -gt 0 ]; then
+  exit 1
+fi