Update build script for Dockerfile.alpine-host

scripts/build-qemu.sh

@@ -27,7 +27,8 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
 OUTPUT_DIR="$PROJECT_DIR/output"
-IMAGE_NAME="${IMAGE_NAME:-ansible-node}"
+IMAGE_NAME="${IMAGE_NAME:-alpine-docker-host}"
+DOCKERFILE="${DOCKERFILE:-Dockerfile.alpine-host}"
 DISK_SIZE_MB="${DISK_SIZE_MB:-2048}"
 
 # ── Colour helpers ──────────────────────────────────────────
@@ -60,10 +61,10 @@ echo ""
 mkdir -p "$OUTPUT_DIR"
 
 # ── Step 1: Build Docker image ──────────────────────────────
-info "Step 1/6: Building Docker image '${IMAGE_NAME}'..."
+info "Step 1/6: Building Docker image '${IMAGE_NAME}' (${DOCKERFILE})..."
 docker build \
     -t "$IMAGE_NAME" \
-    -f "$PROJECT_DIR/Dockerfile" \
+    -f "$PROJECT_DIR/${DOCKERFILE}" \
     "$PROJECT_DIR"
 ok "Docker image built"