ci: require preprovisioned build runner

.gitea/workflows/build-hilink.yml

@@ -15,15 +15,21 @@ jobs:
       - name: Checkout builder branch
         uses: actions/checkout@v4
 
-      - name: Install Buildroot host dependencies
+      - name: Verify provisioned Buildroot toolchain
         shell: bash
         run: |
-          set -eux
-          sudo apt-get update
-          sudo env DEBIAN_FRONTEND=noninteractive apt-get install -y \
-            bash bc bison build-essential ccache cpio curl file flex gawk git \
-            gzip libncurses-dev make patch perl python3 rsync sed tar tree \
-            unzip wget xz-utils
+          set -eu
+          id
+          missing=0
+          for tool in \
+            bash bc bison ccache cpio curl file flex gawk gcc git gzip make \
+            patch perl python3 rsync sed tar tree unzip wget xz; do
+            if ! command -v "$tool" >/dev/null 2>&1; then
+              echo "::error::Missing runner dependency: $tool"
+              missing=1
+            fi
+          done
+          test "$missing" = 0
 
       - name: Build exactly the HiLink URLLC profile
         shell: bash