minimal GHA cache check

Author: Renegade334

.github/workflows/test-linux.yml

@@ -1,4 +1,4 @@
-name: Test Linux
+name: Check GHA cache
 
 on:
   pull_request:
@@ -26,56 +26,27 @@ on:
       - .github/**
       - '!.github/workflows/test-linux.yml'
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
-  cancel-in-progress: true
-
-env:
-  PYTHON_VERSION: '3.14'
-  FLAKY_TESTS: keep_retrying
-  CLANG_VERSION: '19'
-  CC: sccache clang-19
-  CXX: sccache clang++-19
-  SCCACHE_GHA_ENABLED: 'true'
-  SCCACHE_ERROR_LOG: '/tmp/sccache.log'
-  SCCACHE_LOG: 'debug'
-  RUSTC_VERSION: '1.82'
-
-permissions:
-  contents: read
-
 jobs:
-  test-linux:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-24.04-arm]
+  check-cache:
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
-        with:
-          persist-credentials: false
-          path: node
-      - name: Install Clang ${{ env.CLANG_VERSION }}
-        uses: ./node/.github/actions/install-clang
-        with:
-          clang-version: ${{ env.CLANG_VERSION }}
-      - name: Install Rust ${{ env.RUSTC_VERSION }}
+      - name: Generate random data
         run: |
-          rustup override set "$RUSTC_VERSION"
-          rustup --version
-      - name: Set up Python ${{ env.PYTHON_VERSION }}
-        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548  # v6.1.0
+          GHA_CACHE_DIR="$(mktemp -d)"
+          echo GHA_CACHE_DIR="$GHA_CACHE_DIR" >> "$GITHUB_ENV"
+          dd if=/dev/urandom of="$GHA_CACHE_DIR/data" bs=1024 count=1
+      - name: Store cache entry
+        uses: actions/cache/save@v5
         with:
-          python-version: ${{ env.PYTHON_VERSION }}
-          allow-prereleases: true
-      - name: Set up sccache
-        uses: Mozilla-Actions/sccache-action@7d986dd989559c6ecdb630a3fd2557667be217ad  # v0.0.9
+          path: ${{ env.GHA_CACHE_DIR }}
+          key: 'gha-cache-check'
+      - name: Verify cache entry
+        id: verify
+        uses: actions/cache/restore@v5
         with:
-          version: v0.12.0
-      - name: Environment Information
-        run: npx envinfo
-      - name: Build
-        run: make -C node build-ci -j4 V=1 CONFIG_FLAGS="--error-on-warn --v8-enable-temporal-support"
-      - name: Print sccache log
-        run: cat /tmp/sccache.log
+          path: ${{ env.GHA_CACHE_DIR }}
+          key: 'gha-cache-check'
+      - name: Fail on cache miss
+        if: steps.verify.outputs.cache-hit != 'true'
+        run: exit 1
+